Japanese-Style (Kewpie) Mayo Recipe

Kewpie Mayo

Serious Eats / Joshua Bousel

Why It Works

  • Dashi and malt vinegar add depth of flavor. 
  • A dash of monosodium glutamate (MSG) imparts Kewpie’s signature umami.

Editor’s note: This recipe originally appeared as part of the Sauced series that explored recipes for popular condiments. 

If you've made some of our sushi recipes, you've probably seen this recipe I posted for the ubiquitous spicy mayo commonly served with sushi. In doing so, I found that a mere two ingredients—Kewpie mayo and sriracha—combined to make something pretty dead-on delicious. Before publishing that post, I wondered if I should go more in depth and build the sauce from the ground up, but ultimately decided that there's nothing wrong with a really accessible and easy sauce, so long as it works.

It came as no surprise, though, that Serious Eaters wanted to know more—specifically, why Kewpie mayo, and what makes it different? Ever since then, tackling a great homemade Japanese-style mayonnaise has been on my to-do list, and I finally took some time to delve into the depths of this super tangy and extra-creamy sauce.

One Sauce, Two Beasts

Comparing Kewpie and Hellman's mayonnaise side-by-side

Serious Eats / Joshua Bousel

While Kewpie is certainly mayonnaise, pit it against its more commonplace brethren, like Hellmann's, and a whole host of differences quickly reveal themselves (you can read more in our mayonnaise taste test). Those contrasts are stark enough that this Japanese sauce finds itself with die-hard devotees; even some who say its Kewpie or nothing.

Kewpie itself is not a style, but a brand. It was born in 1925 in Japan and became so popular that the baby with outstretched arms, which adorns each package, has come to symbolize Japanese mayonnaise as much, if not more, than the original Kewpie doll it was based on. Compared to standard American supermarket mayos, Kewpie has a smoother and thinner consistency, tangier character, and depth of spices that clearly distinguishes it from its more subtle cousins. It's also got a touch of MSG, one of the triggers for the taste we call umami, which further distinguishes its flavor.

Finding a base for my recipe wasn't all that hard, since the ingredients are more or less printed right there on the bottle: vegetable oil, egg yolk, vinegar, salt, monosodium glutamate, and spices. Of course the devil is in the details, and it took five tries to get this sauce to a respectable place.

The Search for Spice

Vinegar, egg yolk, and spices in the bowl of a food processor

Serious Eats / Joshua Bousel

The first few major differences between regular and Japanese mayo came easily—up the egg count, drop the egg whites, switch to vegetable oil, use rice vinegar instead of white, and add MSG. The latter is a controversial ingredient, but if Japanese mayo flavor is what you're going for, it's essential.

With these changes, it only took minor tinkering with the amounts of each until I had a mayo that was evocative of Kewpie in both flavor and consistency. Still, tasted side-by-side, the Kewpie mayo had a depth mine was clearly lacking, which I figured came down to that ambiguous set of ingredients listed only as "spices."

I started trying to develop those important undertones by adding hot mustard powder and garlic powder, which certainly helped give the mayo a slight kick, but didn't quite get me all the way there. Then through some internet scouring, I found others saying that powdered dashi was the "secret" ingredient. I added just a little bit of that briny soup base (dissolving it first in the vinegar) to my recipe. With one taste, I bought into the dashi addition—it added that little bit of extra flavor you couldn't quite put your finger on. Even then, though, I could tell I was missing something.

Malt Makes the Difference

Noticing my mayo was pale in comparison to the Kewpie that came out of the bottle, I started to think of what might give it a slightly darker hue and a little more pop. After doing some more research, one ingredient sometimes attributed to Kewpie caught my eye: malt vinegar.

I rummaged through my cupboard looking for the malt vinegar that I was sure was there, but it never materialized. That forced me out on a maddening search through every local grocery store and bodega for the stuff, only to come up empty-handed. Determined to perfect the mayonnaise, I found myself on the subway, and finally located a bottle in a grocery a few stops away. Luckily, it wasn't in vain—the malt vinegar did add just enough extra depth to leave me satisfied with my final product.

It may not be an exact replica, but the final recipe produced a silky mayonnaise with a strong tanginess, distinct saltiness, and the right amount of spices to create a flavor that is unmistakably of Kewpie influence. So now any of you super-DIY folks out there can make both your Kewpie and your sriracha from scratch, and then combine the two for a totally homemade sushi mayo. I'll probably still take the easy way out, but it's good to finally know what makes Japanese mayo so different and crave-worthy.

October 09, 2013

After additional testing, this recipe was updated with instructions for using an immersion blender.

Recipe Facts

Prep: 15 mins
Total: 15 mins
Makes: 1 1/4 cups

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Ingredients

  • 2 tablespoons (30ml) rice vinegar

  • 1 tablespoon plus 1 teaspoon (20ml) malt vinegar

  • 1 teaspoon (4g) Diamond Crystal Kosher salt; for table salt, use half as much by volume or the same weight

  • 1/2 teaspoon MSG powder (see note)

  • 1/2 teaspoon Japanese mustard powder

  • 1/8 teaspoon hon-dashi powder (see note)

  • 1/8 teaspoon garlic powder

  • 2 large egg yolks (30g)

  • 1 cup (240ml) vegetable oil

Directions

  1. In a small bowl, whisk together rice vinegar, malt vinegar, salt, MSG, mustard powder, hon-dashi powder, and garlic powder until hon-dashi is completely dissolved.

    Whisking vinegar and seasoning ingredients in a small bowl

    Serious Eats / Joshua Bousel

  2. Place vinegar mixture in the work bowl of a food processor or in the bottom of a cup or jar that just fits the head of your immersion blender along with the egg yolks. Pulse to combine. The egg/vinegar mixture must reach the blades of the immersion blender for that method to work (see note). If the mixture does not reach the blades, double the recipe before attempting.

    Blending kewpie mayo ingredients in a food processor

    Serious Eats / Joshua Bousel

  3. If using a food processor, with the motor running, slowly drizzle in vegetable oil in a thin, steady stream until a thick emulsion forms. If using an immersion blender, pour all of the oil on top of the vinegar mixture and allow to settle for 15 seconds. Place head of immersion blender at bottom of cup and turn it on high speed, allowing it to run without pulsing or moving the blender head until a thick emulsion begins to form, about 15 seconds. As mayonnaise forms, slowly tilt and lift the head of the immersion blender until all oil is emulsified. Transfer mayonnaise to an airtight container and refrigerate for up to 2 weeks.

    Finished mayo in a food processor

    Serious Eats / Joshua Bousel

Special Equipment

Food processor

Notes

Monosodium glutamate is essential to the flavor of Japanese mayonnaise. It can be purchased from most Asian grocers under the Aji-No-Moto brand, in American supermarkets under the brand name Ac'cent, or online. Hondashi can be found in Japanese markets or ordered online.

Nutrition Facts (per serving)
2315 Calories
235g Fat
30g Carbs
23g Protein
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Nutrition Facts
Amount per serving
Calories 2315
% Daily Value*
Total Fat 235g 302%
Saturated Fat 22g 109%
Cholesterol 564mg 188%
Sodium 1978mg 86%
Total Carbohydrate 30g 11%
Dietary Fiber 0g 1%
Total Sugars 24g
Protein 23g
Vitamin C 1mg 3%
Calcium 109mg 8%
Iron 3mg 18%
Potassium 512mg 11%
*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.)