Japanese Egg Soup with Dashi: A Light, Silky Bowl

Japanese egg soup is a light, savory broth with tender ribbons of beaten egg, usually seasoned with dashi, soy sauce, and a little mirin. This easy version uses instant dashi for speed and a small amount of potato starch for a silky texture; Japanese households and regional recipes vary in seasoning and thickness, so you can adjust the bowl to your taste.

Ingredients

4 cups (950 ml) water
1 teaspoon (3 g) instant Japanese dashi powder, or the amount recommended on the package for 4 cups (950 ml) of broth
1 tablespoon (15 ml) Japanese soy sauce, preferably usukuchi (light-colored soy sauce); regular soy sauce works too
1 tablespoon (15 ml) mirin
¼ teaspoon (1.5 g) fine salt, plus more to taste if needed
3 large eggs (about 150 g without shells)
1 tablespoon (8 g) potato starch or cornstarch
2 tablespoons (30 ml) cold water, for mixing with the starch
2 tablespoons (12 g) thinly sliced scallions, for serving

Instructions

Prepare the egg and starch. Crack the eggs into a bowl and beat with a fork or chopsticks just until the yolks and whites are combined. Avoid beating in lots of foam, which can make the ribbons look ragged. In a separate small cup, stir the potato starch with 2 tablespoons (30 ml) cold water until smooth. Slice the scallions and set both mixtures beside the stove so they are ready when the broth is hot.
Make the dashi broth. Add the water to a medium saucepan and bring it to a gentle simmer over medium heat. Stir in the dashi powder until dissolved. Add the soy sauce, mirin, and salt, then taste a spoonful. The broth should be savory but not sharply salty; it will taste a little more intense on its own than it does with egg. Adjust with a pinch of salt or a small splash of soy sauce if needed.
Lightly thicken the soup. Stir the starch mixture again, since starch settles quickly. While stirring the simmering broth, pour in the slurry in a thin stream. Keep stirring for about 30 seconds to 1 minute, until the broth looks slightly glossy and lightly coats a spoon. It should not become thick like gravy. If the soup boils hard, lower the heat before moving on.
Pour in the eggs. Reduce the heat to low so the broth is hot and gently simmering, not bubbling vigorously. Stir the broth in one direction to create a slow-moving current, then drizzle the beaten egg in a thin stream from just above the surface. Move the bowl around the pan so the egg spreads evenly. Let the egg sit for several seconds to begin setting, then give the soup one gentle turn with a spoon. Too much stirring breaks the ribbons into tiny pieces.
Cook the egg safely and finish. Keep the soup at a gentle simmer for about 1 to 2 minutes, until the egg is set in soft ribbons. Stir carefully and check the soup with an instant-read thermometer in several spots; the egg dish must reach the USDA FSIS safe minimum internal temperature of 160°F (71°C). If it has not reached that temperature, continue heating gently and check again. Taste once more, then ladle into warm bowls and scatter the scallions over the top.

Tips

Check your dashi powder’s strength. Instant dashi products vary in saltiness and concentration. Follow the package’s ratio if it differs from the amount listed, and add the soy sauce and salt gradually. Dashi is the savory backbone of the soup, so a well-balanced broth matters more than using a particular brand or exact powder measurement.
Use cold water for the starch slurry. Mixing starch directly into hot broth can make stubborn lumps. Stir the slurry immediately before pouring because it settles, and add it slowly while stirring the pot. For a clear, unthickened soup, you can omit the starch and its water; the egg ribbons will still set, but the broth will feel lighter and less glossy.
Control the heat when adding egg. A rolling boil can shred the egg and make it tough. Lower the heat before pouring, use a thin stream, and avoid stirring repeatedly. If you want longer ribbons, pour steadily while moving the egg around the pan; for smaller curds, stir a little more after the egg starts to set.
Keep the garnish fresh. Add scallions at the table rather than cooking them in the pot if you want their mild bite and bright color. If scallions are unavailable, finely sliced chives work, although they have a more delicate flavor. Do not leave the finished soup out for more than 2 hours before refrigerating leftovers.

Serving Suggestions

Serve Japanese egg soup hot in small bowls as part of a Japanese-style meal, or pour a larger portion into a bowl for a light lunch. Its mild dashi flavor pairs naturally with steamed rice, grilled fish, tofu, sautéed greens, or a simple plate of pickled vegetables. The soup is also useful at the start of a meal because it is warm and savory without being as rich as a creamy soup.

For a more substantial meal, serve it with a bowl of rice and a side of edamame or vegetables dressed with sesame. If you are serving several dishes, keep the soup in a covered saucepan over very low heat only briefly, and stir gently before ladling so the egg and broth are evenly distributed. Avoid holding it at a boil: continued bubbling can make the egg firm and the ribbons less delicate. Warm the serving bowls with hot water and dry them before ladling if you would like the soup to stay warm longer at the table.

Variations

Make it vegetarian. Use kombu dashi or a vegetarian dashi powder in place of standard instant dashi, which may contain bonito fish. To make kombu dashi, soak a piece of kombu in water and gently heat the water, removing the kombu before it boils. Kombu is a traditional seaweed that can be harder to find; a mild vegetable broth is a practical substitute, though it gives the soup a less distinctly Japanese, sea-savored character. Check the broth’s salt level before adding soy sauce.

Use a different starch. Potato starch gives the broth a particularly smooth, slightly elastic texture, while cornstarch is a convenient pantry alternative and makes the soup somewhat less glossy. If you have neither, leave it out rather than adding flour, which can cloud the broth and give it a heavier texture. The soup will still be comforting, just thinner.

Add mushrooms or greens. Simmer a small handful of thinly sliced shiitake mushrooms in the dashi until tender before adding the starch and egg. Enoki mushrooms, spinach, or finely sliced bok choy can also be added, but cook them until tender first. Extra vegetables release water and can dilute the seasoning, so taste the broth again before pouring in the egg.

Adjust the seasoning or egg texture. For a slightly sweeter, rounder broth, add another teaspoon (5 ml) of mirin; for a more pronounced savory flavor, add soy sauce a teaspoon (5 ml) at a time. You can use two eggs for a broth-forward soup or four for a more egg-rich bowl. A larger quantity of egg makes the soup fuller, so pour it in gradually and allow enough time for it to set safely.

Storage and Reheating

Egg ribbons are at their softest just after cooking, so this soup is best made close to serving time. If you have leftovers, transfer them to a shallow, covered container and refrigerate within 2 hours. Keep the soup refrigerated for up to 3 days; the egg may firm up and the broth may lose some of its silky texture as it sits. Freezing is not recommended because thawed egg tends to become spongy and separate from the broth.

Reheat only the portion you plan to eat in a small saucepan over low to medium-low heat, stirring gently so the egg does not break up too much. Heat leftovers to 165°F (74°C), checking with a food thermometer, and serve promptly. Avoid repeated cooling and reheating. If the soup looks or smells unusual, or has been left at room temperature for more than 2 hours, discard it rather than tasting it to check.

Frequently Asked Questions

What is Japanese egg soup called?

Japanese egg soup is often described as kakitama-jiru, a clear soup with beaten egg stirred into hot broth. Names and recipes vary, and some versions are thicker or include vegetables. This recipe follows that general style, using dashi and seasoning the broth with soy sauce and mirin.

Can I make Japanese egg soup without dashi powder?

Yes. Use prepared kombu dashi, kombu-and-bonito dashi, or another unsalted dashi that provides about 4 cups (950 ml) of broth. If you cannot find dashi, use a mild vegetable broth and season it carefully. The result will still be a pleasant egg soup, but it will not have the same characteristic dashi flavor.

Why did my egg turn into small pieces instead of ribbons?

The broth may have been boiling too hard, the egg may have been poured in too quickly, or the soup may have been stirred vigorously after the egg went in. Lower the heat to a gentle simmer, drizzle the egg in a fine stream, and wait a few seconds before gently moving the spoon through the soup. The egg will still taste good if the pieces are small.

Can I prepare the soup ahead of time?

You can measure the seasonings, beat the eggs, and mix the starch slurry shortly before cooking, but the egg is best added just before serving. If you need to cook the soup ahead, refrigerate it within 2 hours and reheat it to 165°F (74°C) before serving. Expect the egg to be firmer after reheating than it is when freshly cooked.

Is mirin necessary, and what can replace it?

Mirin adds gentle sweetness and rounds out the soy and dashi, but the soup can be made without it. Use 1 tablespoon (15 ml) of water plus ½ teaspoon (2 g) of sugar as a practical substitute, or simply omit the mirin and adjust the seasoning. The substitute will not have mirin’s subtle fermented flavor, so taste the broth before serving.

Can I use whole eggs straight from the refrigerator?

Yes. Cold eggs are fine; beat them just before adding them to the hot broth. The temperature of the egg may briefly cool the soup, so allow it to return to a gentle simmer and verify that the soup reaches 160°F (71°C), the USDA FSIS safe minimum for egg dishes. This step helps ensure the egg is fully cooked without relying only on its appearance.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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