Easy One-Pot Miso Soup Recipe

Skip a few steps without worrying about sacrificing flavor.

A white bowl of easy, one-pot miso soup.

Serious Eats / J. Kenji Lopez-Alt

Why It Works

  • By more aggressively simmering a smaller amount of kombu and bonito flakes in water, you can skip the two-step dashi-making process and prepare a ‘second dashi’-style broth right from the get-go.
  • Pressing miso paste through a fine-mesh strainer easily removes lumps and allows it to be quickly incorporated into the broth.

Miso soup has always been one of my favorite simple meals. Growing up, we'd have a near-constant supply of instant miso soup in the fridge. That'd be a packet of dashi granules (like the Japanese version of Knorr Chicken Bouillon), along with a little squeeze tube of miso paste. The kits would perhaps include bits of dried wakame seaweed, some dehydrated scallions, and some dehydrated fried tofu. It was a meal simple enough for a kid to make on a Saturday morning without waking his parents.

Those soups are great, but to compare miso soup from a packet to real-deal miso soup made with an actual dashi stock, high-quality miso, and fresh ingredients is like comparing instant chicken noodle soup to your Jewish grandmother's. Assuming you have a Jewish grandmother.

Even between restaurants, quality can vary widely. The worst—which are usually found at the all-you-can-eat sushi and teriyaki houses—taste of not much more than hot salty water with miso stirred into it. I'd be surprised if they were using an actual dashi at all. The best, on the other hand, are complex, multi-faceted affairs.

Rich with the briny flavors of ocean kelp, a hint of rich smokiness from dried smoked bonito, with a deep, earthy, almost cheese-like flavor from high-quality, well-aged soybean paste. It's like drinking pure liquid umami gold. There's nothing better to finish your meal with (or to finish off a hangover with, for that matter).

Here's how you do it at home, and it all starts with the stock.

Number One Stock!

Dashi is the base of all Japanese cuisine, and it can be as complex to prepare as it is simple in appearance. It's made from only three ingredients—water, kombu (giant sea kelp), and katsuobushi (smoked, dried, shaved bonito)— and the process of extracting flavor is one of deep reverence amongst Japanese chefs.

The two major types of dashi are ichiban dashi—or first dashi—and niban dashi—second dashi. Ichiban dashi is made by steeping fresh dried kombu and bonito flakes in water that is kept at a sub-simmer. The idea is to use a great deal of kombu and bonito, steeped at a relatively low temperature. By doing so, you develop a broth with specific flavors that are best extracted at low temperatures, without extracting many of the heavier, stronger flavors. At the same time, by not allowing the liquid to simmer, you get stock that is crystal clear.

It's very much like brewing a cup of tea, and just like tea, it's finished in a matter of minutes. Ichiban dashi is delicate and mild, used primarily for the clear soups (suimono) that form an essential part of a traditional Japanese meal.

This is not the dashi we are looking for. Move along.

Niban dashi is made by taking the spent bonito flakes and kombu from the first dashi, covering them with more water, then simmering it all for a longer period of time—10 minutes or so is normal—to extract what's left of the flavor. What results is a much more intense, slightly cloudy, smoky, briny broth. This is the broth used to make miso soup.

From an ounce of kombu and an ounce of dried bonito flakes, you end up with about a quart of ichiban dashi and a quart of niban dashi.

A pot of niban dashi for miso soup made with kombu and bonito flakes.

Serious Eats / J. Kenji Lopez-Alt

Now most authentic recipes for miso soup I've found call for this second dashi, but my problem with that is this: In a restaurant setting or in a home that cooks a ton of Japanese food, making both ichiban dashi and niban dashi makes sense—both are used to cook with, and it's more economical to extract as much flavor as possible out of your ingredients.

However, most home cooks outside of Japan aren't going to be cooking enough Japanese food to use up a quart of ichiban dashi every time they want to make a quart of niban dashi to make their miso soup with. So why bother?

Instead, I wondered if I could make a niban-dashi-esque broth right from the start using fresh dried kombu and bonito flakes. Indeed you can. By not bothering with the initial sub-simmer extraction and going straight for a fully simmered niban dashi, you not only extract enough flavor to produce a miso soup as rich as you'd like, but you can also get away with using less kombu and dried bonito.

Tasted side-by-side against a true niban dashi, there are indeed a few differences in flavor and appearance (not to say that one tastes better than the other, per se), but once you add the miso, those minor nuances are rendered irrelevant.

The Miso

As for the miso itself, you can use whatever shade of fermented soybean paste you'd like. White miso, red miso, and dark miso are all used in various regions of Japan. I grew up eating miso soup made with red miso, so that's generally what I go for.

You want to ensure that the miso is entirely lump-free as it gets incorporated into the broth. There are a couple ways to do this. Some folks start with miso in the pot and slowly add hot broth in a steady stream, stirring vigorously with chopsticks or a whisk as the water gets incorporated.

I find it easier to use a fine-mesh strainer.

Pressing miso paste broth through a sieve for a pot of easy miso soup.

Serious Eats / J. Kenji Lopez-Alt

By dipping the strainer down into a pot of hot broth then adding the miso to the top, you can slowly press it through the strainer with the back of a spoon, incorporating it easily. This also conveniently removes any large-ish lumps which you can discard.

As for other ingredients, it's up to you. I personally love the texture and flavor of wakame, a dried seaweed. You can reconstitute it separately in hot water, but personally, I don't have the patience—I just add it to my hot soup and let it soften on its own. Firm silken tofu cubes are a must for me—I love their slippery texture as they heat up in the broth—as are scallions.

If I'm feeling like a miso soup lush, I'll go ahead and add some hon shimeji or slippery nameko mushrooms to the mix, or if I can get my hands on them, tiny cockles.

June 2012

Recipe Facts

Active: 20 mins
Total: 20 mins
Serves: 4 to 6 servings

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  • 1 1/2 quarts water

  • 1/2 ounce kombu (approximate 4- by 6-inch piece, see notes)

  • 1/2 ounce grated bonito flakes (about 3 cups, see notes)

  • 6 tablespoons white or red miso paste, or a mix

  • 8 ounces firm silken tofu, cut into 1/2-inch cubes (optional)

  • 1/2 ounce dried wakame seaweed (1/4 cup, optional)

  • 4 ounces fresh mushrooms, sliced if necessary (such as honshimeji, namako, or shiitake, optional)

  • A handful of small live cockles (optional)

  • 4 whole scallions, thinly sliced (optional)


  1. Combine water, kombu, and bonito flakes in a large saucepan and bring to a boil over high heat. Reduce to a bare simmer and cook for 5 minutes. Remove from heat, let cool for 5 minutes, then strain through a fine-mesh strainer. Discard solids.

  2. Return broth to a medium saucepan and set over low heat to keep warm, but not boiling. Place a fine-mesh strainer in broth and add miso paste to the strainer. Use the back of a spoon to press paste through strainer into broth. Discard any large grains that don't pass through.

  3. Add tofu, wakame, mushrooms, and cockles (if using), and allow to cook without boiling until ingredients are warm and wakame has rehydrated, about 5 minutes. Garnish with scallions (if using) and serve immediately.

Special Equipment

Fine-mesh strainer, large and medium saucepans


Kombu and katsuobushi can be found in any Japanese market or in the international section of most well-stocked supermarkets. For best results, use real kombu and katsuobushi. Alternatively, you can use powdered dashi mix. Follow instructions on the package.

Nutrition Facts (per serving)
42 Calories
1g Fat
5g Carbs
4g Protein
Show Full Nutrition Label Hide Full Nutrition Label
Nutrition Facts
Servings: 4 to 6
Amount per serving
Calories 42
% Daily Value*
Total Fat 1g 1%
Saturated Fat 0g 1%
Cholesterol 4mg 1%
Sodium 818mg 36%
Total Carbohydrate 5g 2%
Dietary Fiber 1g 3%
Total Sugars 1g
Protein 4g
Vitamin C 0mg 1%
Calcium 25mg 2%
Iron 1mg 3%
Potassium 72mg 2%
*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.)