Lomo Saltado (Peruvian Stir-Fried Beef With Onion, Tomatoes, and French Fries) Recipe

Tender slices of deeply seared beef, blister-y onions, juicy tomatoes, and crispy French-fried potatoes unite in this classic Chinese-Peruvian stir-fry.

overhead view of lomo saltado plated with french fries and white rice

Serous Eats/Vicky Wasik

Why It Works

  • Tender cuts of steak, like the tenderloin or skirt steak, cook up quickly while remaining juicy.
  • Stir-frying in small batches guarantees a good sear and deep flavor.
  • Optionally allowing the contents of the pan to occasionally catch fire will deepen the flavor even more (but this is not required if it makes you nervous).

At first glance, Peruvian lomo saltado looks like something my mom might have invented to clean out years of fridge and freezer buildup. There are chunks of beef, mingling in a dark brown sauce with onions, scallions, peppers, cilantro, garlic, and...tomato? And are those soggy yellow things French fries? Appearances, as we well know, can be deceiving.

Lomo saltado is, in reality, a deeply thoughtful dish made with a set of ingredients and techniques that reflect the mix of cultures that contributed to its existence. It's an example of chifa cooking, a term that describes the Chinese-Peruvian hybrid cuisine created by Chinese immigrants who moved to South America more than a century ago, as well as the restaurants where that food is served.

This particular dish combines indigenous American ingredients, like potatoes, tomatoes, and peppers, with Chinese ingredients and techniques, like soy sauce and stir-frying. Some versions call for tossing the French fries directly into the wok to coat them in the sauce while others put the fries on the side to maintain their crispy texture. As you can see, I've kept them on the side, but there's no right or wrong way to do it.

The secret to great lomo saltado is twofold. First, select an appropriate cut of beef. Second, stir-fry it properly, which can be tricky to do on a home range. Well, maybe it's threefold: Third, fry your French fries so that they're the best they can possibly be, but I'll link to our article on how to make delicious, crispy McDonald's-style French fries instead of writing about it here.

Finding the Right Cut of Beef

Lomo is the Spanish word for "loin," but since a cow has multiple cuts that are referred to as a "loin," it's not all that revealing of a term. Are we talking about the short loin, the tenderloin, or the sirloin (which itself can be split into the top and bottom sirloins)? The truth is, we need to consider all of the above—and more.

What we want is a tender and quick-cooking cut, one that's low in tough, collagen-rich connective tissue. These quick-cooking cuts are better suited to being briefly seared or grilled since there's not much time for the heat to transform the meat. Prolonged cooking does little more than dry these sorts of cuts out. Tough, collagen-rich cuts of beef, like the chuck, brisket, and shanks, on the other hand, are generally best suited to the stewing pot, where long exposure to gentle heat will melt that chewy collagen into silky and soft gelatin.

The toughness of any cut of meat is largely the result of how much the animal used that muscle during its life. Harder-working muscles build up more collagen, helping to make them stronger and thus tougher. Muscles that the animal relies on less are weaker and retain an inherent tenderness.

For lomo saltado, that means good choices include strips of tenderloin (also called the filet mignon), sirloin, and other popular cuts of steak, like the strip. The tenderloin is the most tender of the bunch, but it's expensive and not as deeply flavored as some of the other options. Still, if buttery-soft pieces of meat are what you're after, it's the way to go.

The sirloin will work, too, but keep in mind that it can be more prone to growing tough and dry if exposed to heat even a minute longer than intended. My personal favorite quick-cooking cut is skirt steak, which has a bit more chew but packs one of the biggest payloads of beefy flavor.

While wandering around the internet, trying to find out whether I could learn any Peruvian wisdom on the best beef cuts for lomo saltado, I came across a video of the chef Gastón Acurio, in which he visits a butcher who tells him that a cut called the huachalomo is the one to get.

Huachalomo is from the chuck, a very tough primal cut that includes the cow's shoulder and neck. But the chuck is made up of several different muscles, a few of which are tender if separated from the rest. Despite lots of web searches, pleas for help on social media, and a trip to my local Colombian butcher, I was unable to find out what exactly the huachalomo is. One possibility is that it's the teres major, a part of the chuck that is sometimes called the "faux filet" for its tender texture.

The teres major would indeed be a good option for lomo saltado, but you'll have to be careful not to get just any part of the chuck—after a brief discussion with the Colombian butcher I visited, he cut me some chuck that he said would be good for lomo saltado, but it made an inedibly gristly batch.

No matter which piece of beef you end up buying, make sure to cut it properly by slicing it into thin strips against the grain (meaning, perpendicular to the direction in which the muscle fibers run). In the photo in the recipe, you can see me doing it with beef tenderloin. In the photo below, I do it with a skirt steak, first dividing it into manageable sections and then crosscutting those sections against the grain into strips.

Composite of slicing skirt steak .

Serious Eats/Vicky Wasik

Peruvian Lomo Saltado: Step by Step

Stir frying Peruvian lomo saltado in a wok.

Serious Eats/Vicky Wasik

The key to great lomo saltado is to stir-fry it properly. This is no easy task in most home kitchens since they don't have the firepower to sufficiently heat a good wok and keep it hot. Truth is, you don't even need a wok—you can use a large cast iron or stainless steel skillet—but what you do need is an understanding of how to make a stir-fry like this work at home.

The answer is to stir-fry all of the ingredients in small batches. Exactly how small depends on how hot your burner is. At both work and home, I'm lucky enough to have high-powered burners that give me some real heat, though it's still not as much as a wok really requires. On my burners, I was able to successfully make this dish by splitting the beef and onions into two batches each. Many home ranges will have an even weaker output, possibly requiring that you divide the beef and onions into thirds. The number of batches ultimately won't change anything except the time it takes to make the recipe.

The reason for stir-frying in small batches has to do with the unique flavor high-heat wok cooking imparts to the food, which is sometimes called wok hei, a term that describes the unique flavor of deep-searing and the combustion of oil and fat droplets. Put too much food in the wok at once, and the pan's temperature will drop, the food steaming itself instead of searing. You'll get no wok hei that way.

Only after everything has been properly stir-fried does it all go back into the wok at once for a final tossing.

Step 1: Stir-Fry the Beef

High heat and flames stir-frying in wok.

Serious Eats/Vicky Wasik

Set your wok or pan of choice over the highest heat your stove can manage, and leave it there until smoke begins to curl upward from its surface. Add some oil and let that oil begin to smoke heavily.

This is a good moment to stop and discuss fire safety. Wok cooking is high-heat cooking, and when you do it right, you won't just be flirting with setting things on fire—you may actually (intentionally) set the food on fire, provided you're using a gas range.

Now, you don't have to. There are plenty of very prudent reasons not to want flames shooting up from a pan in your own home. If the idea makes you nervous, simply lower the heat to more manageable levels; you won't get the same flavor, but you also won't be attempting something that can be downright scary and potentially dangerous.

If you are willing to try to do a real stir-fry, flames and all, then you'll want to think through your kitchen ventilation in advance, since it will get incredibly smoky. You should probably also read up on kitchen fire safety so that you're prepared to respond if anything does go wrong.

Okay, back to the beef. At this point, both the wok and the oil should be billowing smoke. Season the beef all over with salt, and add just enough meat to the pan so that it sears intensely without steaming itself. Spread the pieces evenly so that there's plenty of space around each, and leave the beef alone for 30 seconds or a minute, letting that first side sizzle and char.

Now start tossing the beef, tilting the wok downward toward the flame so that the mist of sizzling oil catches fire (or, again, don't, if it's out of your comfort zone). It will likely be dramatic, with big bursts of fire as the oil combusts. As big as those flames get, they won't last long, and they'll usually die out within a few seconds of catching. If you keep tossing the beef, you can keep igniting it. This is one of the keys to achieve the very best flavor.

As soon as you've seared the beef very well on at least one side, and it no longer looks raw anywhere, transfer it to a heatproof platter to rest. Repeat this stir-frying step with the remaining beef.

What you'll notice after a few minutes on the platter is that the beef will release juices. Those juices are critically important to lomo saltado's sauce, so make sure to keep them.

Step 2: Sear the Red Onion

With the beef done, it's time to return the wok to the burner and get it smoking hot again with even more oil. And, once again working in batches, sear the red onion.

You have a very specific goal here: to get some deep browning and char on parts of the onions slices, but still leave them with some lingering crispness. A good lomo saltado will not be full of mushy vegetables. Instead, they should be crisp-tender when it's complete.

The key to this texture comes down to two factors. The first is the size of the onion and other vegetables; they should be cut thick enough that there's little risk they'll grow too soft in the time it takes to sear them.

The second is small-batch stir-frying. Overcrowd the pan, and you'll steam the vegetables in their own moisture instead of searing them. So add just enough onion to the wok in each batch that it will sizzle and fry in the smoking oil.

As soon as you have some good browning on the onions, transfer them to a platter as well, and repeat with the remaining onions.

Step 3: Stir-Fry the Remaining Vegetables

At this point, we're getting to the end game. When the wok returns to its super-heated stage, with smoke billowing off it, sear the scallions. They soften quickly, so work in whatever batch size is necessary to avoid steaming.

After that, add the pepper. This will ideally be thin strips of ají amarillo peppers, a Peruvian chili pepper that's floral and fruity. They're not easy to find fresh in US markets, but a good Latin grocery or supermarket will often keep bags of whole peppers in the freezer section. Simply defrost, remove the seeds and stems, and cut the peppers lengthwise into strips. In the event you can't locate any ají amarillos, a mix of jalapeños and red bell pepper makes a great substitute.

Peruvian aji amarillo pepper.

Serious Eats/Vicky Wasik

Finally, add the tomatoes. The tomatoes are difficult to sear given how watery they are, so you'll need to decide whether you can do this while the scallions and peppers are in the wok, or whether you should break it all down into smaller groupings to increase your chances of a good sear.

What you absolutely don't want are the tomatoes turning to total mush on you, so no matter what, avoid overcooking them. This is a good time to add the final aromatics—minced garlic and ginger—tossing them for a quick sauté.

Step 4: Put It All Together and Finish the Sauce

Now for the finishing move. Return everything to the wok, including the beef and all its juices, along with the two other important sauce and flavor components: soy sauce and vinegar. I started my testing on this recipe with distilled white vinegar, which works fine, but a Peruvian friend suggested I use apple cider vinegar instead, which has a slightly softer acidity and more rounded flavor. A flavorful brown sauce should form as the beef juices, soy sauce, vinegar, and oils all blend together.

Saucy juices in a wok of Peruvian lomo saltado.

Serious Eats/Vicky Wasik

Season the mixture with salt, some freshly ground black pepper, and a nice big pinch of minced fresh cilantro, and you're done. Get it out of the wok and onto the serving plates.

Step 5: Want Fries With That? And Rice?

You're nearly done. Lomo saltado absolutely must come with French fries; leave them out, and it's not lomo saltado anymore. If you want, you can toss them into the wok with everything else. This way, the fries come out soggy (kinda bad) but coated in sauce (kinda awesome). Or, pile them off to the side to keep them crispy, and dip them in the sauce as you eat.

In Peru, the fries are often prepared as thick steak fries, using a yellow potato. Go with whatever kind of fries you want, keeping in mind that homemade is best. We've more than got you covered on how to make perfect thin and crispy ones.

A proper plate of lomo saltado isn't complete without rice. Adding one starch on top of another starch may seem like overkill, but it's part of the spirit of the dish. To the Chinese who helped create lomo saltado, no meal is complete without rice. And to the Peruvians who also helped create it, the same can be said for potatoes. Neither is wrong, which is why putting both on the plate is so right.

8:18

Lomo Saltado: Peruvian Beef Stir-Fry

March 2019

Recipe Facts

Prep: 5 mins
Cook: 20 mins
Active: 25 mins
Total: 25 mins
Serves: 2 servings

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Ingredients

  • 1 pound (450g) beef tenderloin, skirt steak, or other tender and flavorful quick-cooking steak

  • 1/4 cup (60ml) peanut, canola, or vegetable oil, divided, plus more if needed

  • Kosher salt

  • 1 medium (8-ounce/225g) red onion, cut into 1/2-inch slices

  • 4 scallions (about 2 ounces/60g total), roots and any wilted parts trimmed, remainder cut into 2-inch lengths

  • 1 fresh or frozen ají amarillo chile pepper (about 2 ounces/60g), defrosted if frozen, then stemmed, seeded, and sliced lengthwise into matchsticks (see notes)

  • 2 medium plum tomatoes (about 5 1/2 ounces/160g total), cored and cut into 3/4-inch-thick wedges

  • 2 medium cloves garlic, minced

  • 1-inch piece peeled fresh ginger (about 1/4 ounce; 7g), minced

  • 1 tablespoon plus 1 teaspoon (20ml) soy sauce

  • 1 tablespoon (15ml) apple cider vinegar

  • 2 teaspoons minced fresh cilantro leaves and tender stems

  • Freshly ground black pepper

  • French fries, for serving

  • Cooked long-grain rice, for serving

Directions

  1. Cut the beef across the grain into roughly 1/2-inch-thick strips.

    Composite of cutting beef across the grain.

    Serious Eat/Vicky Wasik

  2. In a wok or large cast iron or stainless steel skillet, heat 2 tablespoons (30ml) oil over high heat until heavily smoking. Meanwhile, season beef all over with salt.

  3. Working in batches, add just enough beef to the pan to sear it heavily without steaming in its own juices. Spread the beef around so the pieces are evenly spaced apart and allow to cook until very well seared and charred on one side, 30 seconds to 1 minute. Stir and toss beef so that it cooks all over, about 30 seconds longer; if you are working over a gas flame and aren't afraid of some fire, toss the beef near the flame so that the oil briefly combusts in big bursts. (If this makes you nervous, don't allow it to catch fire. Instead, manage the heat to prevent flare-ups.) Using a spatula, transfer beef to a platter to rest. Repeat with remaining beef, always getting the pan smoking-hot before the next batch and adding more oil if needed.

    Composite of stages of stir-frying beef in wok for lomo saltado.

    Serious Eats/Vicky Wasik

  4. When all the beef is cooked, return the empty pan to high heat. Add 1 tablespoon (15ml) oil and heat until smoking. Working in batches, add just enough red onion so that it sears and browns rapidly without steaming, about 30 seconds. Toss a few times until the onion is crisp-tender. Using a spatula, transfer onion to a platter. Repeat with remaining onion, always heating the pan until smoking first and adding more oil if necessary.

    Composite of stir-frying sliced red onion in wok.

    Serious Eats/Vicky Wasik

  5. Return the empty pan to high heat, add 1 tablespoon (15ml) oil, and heat until smoking. Working in batches if necessary, add scallions and cook, without stirring, until seared on bottom side, about 30 seconds. Push scallions to the side and add peppers. Cook until seared, about 30 seconds longer.

    Composite of stir-frying scallions, sliced ají amarillo, tomatoes, and minced garlic in wok.

    Serious Eats/Vicky Wasik

  6. Push scallions and peppers to the side and add tomatoes to the pan, allowing them to sear on one side, about 30 seconds. (If your burner isn't very strong, you can remove the scallions and peppers from the pan before adding the tomatoes to guarantee good searing. Otherwise, leave them in.) Try not to let the tomatoes grow too soft and pulpy; it's better that they retain their shape rather than brown to the point of becoming mushy.

  7. Add garlic and ginger and cook, tossing and stirring constantly, until lightly sautéed and fragrant, about 15 seconds. Add soy sauce and vinegar and toss to combine.

  8. Return beef and all accumulated juices to the pan along with the red onions. (If you've removed the scallions and peppers, add them back now, too.) Add cilantro. Toss over high heat to combine well, seasoning with salt and pepper as you go. Remove from heat.

    Composite of combining and finishing ingredients for lomo saltado in wok.

    Serious Eats/Vicky Wasik

  9. Spoon stir-fry onto plates with a mound of cooked rice and French fries and serve right away.

Special Equipment

Wok

Notes

Ají amarillo peppers are fruity and floral, and they pack a good dose of heat. If you can't find fresh ones, good Latin groceries will often stock frozen whole ones in the freezer section. Alternatively, you can use a similar quantity of red bell pepper and jalapeño.

Nutrition Facts (per serving)
1342 Calories
78g Fat
92g Carbs
66g Protein
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Nutrition Facts
Servings: 2
Amount per serving
Calories 1342
% Daily Value*
Total Fat 78g 100%
Saturated Fat 18g 91%
Cholesterol 134mg 45%
Sodium 1357mg 59%
Total Carbohydrate 92g 34%
Dietary Fiber 9g 34%
Total Sugars 10g
Protein 66g
Vitamin C 72mg 358%
Calcium 136mg 10%
Iron 9mg 49%
Potassium 2100mg 45%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)