Japanese Cabbage Soup with Miso and Tofu

Japanese cabbage soup is a light, savory miso broth filled with tender cabbage, tofu, carrot, and scallions. It comes together in one pot, and the cabbage softens quickly while dashi and miso give the soup a deeply satisfying Japanese-style flavor.

Ingredients

6 cups (1.4 L) water
1½ teaspoons (6 g) instant dashi granules, preferably kombu dashi for a vegetarian soup; check the package because many dashi blends contain fish
½ medium yellow onion, thinly sliced, about ½ cup (75 g)
1 medium carrot, thinly sliced into half-moons, about ½ cup (60 g)
4 packed cups (280 g) green cabbage, cored and thinly sliced
8 ounces (225 g) soft or medium-firm tofu, cut into ½-inch (1.25 cm) cubes
3 tablespoons (54 g) white or yellow miso
2 scallions (20 g), thinly sliced
1 teaspoon (5 ml) soy sauce, optional, for a slightly saltier finish
1 teaspoon (5 ml) toasted sesame oil, optional, for serving
1 teaspoon (3 g) toasted sesame seeds, optional, for serving

Instructions

Prepare the vegetables and tofu. Slice the onion, carrot, cabbage, and scallions, then cut the tofu into bite-size cubes. Keep the cabbage strips fairly thin so they become tender in a few minutes without disappearing into the broth. If the tofu is packed in water, drain it gently; pressing it is not necessary for this soup.
Make the dashi broth. Add the water and dashi granules to a medium pot, then set it over medium-high heat. Stir to dissolve the granules and heat until the broth is steaming and just beginning to simmer, about 8 minutes. Avoid a hard, rolling boil; a gentle simmer is enough and leaves room to cook the vegetables without reducing the broth too much.
Simmer the firmer vegetables. Add the onion and carrot. Keep the broth at a gentle simmer for 5 minutes, stirring once or twice. The carrot should begin to soften but still hold its shape. If the broth boils vigorously, lower the heat; brisk boiling can make the vegetables less pleasant and may evaporate more liquid than intended.
Add the cabbage. Stir in the sliced cabbage and simmer for 5 minutes. At first, it may look like a lot of cabbage for the pot, but it will wilt as it heats. Stir gently once or twice to submerge the leaves. For cabbage with a little bite, check it after 3 or 4 minutes; for softer cabbage, use the full 5 minutes.
Warm the tofu. Add the tofu cubes and simmer gently for 2 minutes, just until they are heated through. Stir carefully around the cubes rather than vigorously, so the tofu keeps its shape. Turn off the heat before adding the miso.
Dissolve the miso and finish. Put the miso in a small bowl and ladle in about ½ cup (120 ml) of hot broth. Whisk or stir until smooth, then pour it back into the pot and stir gently. Keep the soup off the heat; boiling miso can dull its aroma and make the broth taste harsher. Taste before adding the optional soy sauce, since miso and dashi mixes vary in saltiness. Divide among bowls and top with scallions, plus sesame oil or sesame seeds if using.

Tips

Choose dashi with the diners in mind. Instant dashi is convenient, but some packets contain bonito or other fish. Kombu dashi gives the soup a seaweed-based savory flavor and keeps it vegetarian. If you cannot find dashi granules, use 6 cups (1.4 L) unsalted vegetable broth instead; it will taste less distinctly Japanese, so add a little extra miso only after tasting.
Do not boil the soup after adding miso. Miso brings a rounded, fermented flavor that is easiest to notice when it is stirred in off the heat. If the soup cools while you are serving, warm it gently over low heat, stirring, but take it off the stove before it boils.
Adjust the cut to the vegetable. Thin cabbage ribbons and carrot slices cook at roughly the same pace as listed. If you cut the carrot thicker, simmer it for a few extra minutes before adding the cabbage. If using delicate napa cabbage, add its leafy parts later because they soften faster than the firm ribs.
Season in stages. Miso, dashi, and soy sauce can all contribute salt. Start with the listed miso, taste the finished broth, and add soy sauce only if needed. A splash of water can soften a broth that is too salty; more miso is not always the right fix.

Serving Suggestions

Serve the soup hot as part of a Japanese-inspired meal, or enjoy a large bowl as a simple lunch. Steamed rice is an easy companion: serve it on the side so each person can alternate spoonfuls of rice and broth, or add a small mound to the bowl just before eating. The soup also fits alongside grilled fish, pan-seared salmon, or a vegetable-and-rice plate. If serving it with a salty main dish, leave out the optional soy sauce and let the broth remain gentle.

For a more filling bowl, offer cooked rice, noodles, or extra tofu separately so each person can add the amount they want. Miso soup is usually served in smaller bowls as one part of a meal, but this cabbage version has enough vegetables and tofu to work as a light standalone serving. Add scallions at the table rather than too far ahead if you want their fresh, crisp flavor to stand out. A few sesame seeds add a nutty finish, while sesame oil is best used sparingly because its aroma can quickly dominate the mild broth.

Variations

Use napa cabbage: Replace the green cabbage with 4 packed cups (300 g) sliced napa cabbage. Add the thicker white ribs with the carrot and onion, then stir in the leafy sections for the final 2 to 3 minutes. Napa cabbage makes the broth softer and more delicate, while green cabbage gives it a slightly sweeter, sturdier texture.

Add mushrooms: Include 1 cup (70 g) thinly sliced shiitake mushrooms or 1 cup (75 g) sliced cremini mushrooms. Add them with the carrot and onion so they have time to soften. Shiitake contributes a more pronounced savory character; cremini is easier to find and gives a familiar earthy flavor.

Make it heartier with noodles: Cook 4 ounces (115 g) dried udon or soba noodles according to their package directions in a separate pot, then drain and divide them among bowls. Ladle the soup over the noodles just before serving. Cooking noodles separately keeps their starch from clouding the broth and makes leftover soup easier to store.

Change the miso: White miso is usually mild and slightly sweet, while yellow miso tastes more assertive. Red miso is saltier and more robust, so begin with 2 tablespoons (36 g), dissolve it into the broth, and add more only if needed. Miso varies by maker, so tasting is more reliable than assuming every variety has identical saltiness.

Make a vegan bowl: Use kombu dashi and confirm that the miso contains no fish-based ingredients. Many miso pastes are plant-based, but ingredient labels are worth checking. A splash of soy sauce or tamari can reinforce the savory flavor if the kombu broth seems too gentle; tamari may also be salty, so taste before adding more.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours in a covered container. The soup keeps for 3 to 4 days in the refrigerator. The cabbage will soften further as it sits, and tofu can become a little more delicate, but the broth remains suitable for reheating. If you expect leftovers, consider storing the soup without any noodles, which are better cooked fresh and added to individual bowls.

Reheat only the amount you plan to eat in a saucepan over medium-low heat, stirring gently until the soup reaches 165°F (74°C), checked with a food thermometer. Avoid letting it boil; once it reaches the safe reheating temperature, serve it promptly. You can also reheat a portion in the microwave in a covered, microwave-safe bowl, stopping to stir so the temperature is even, then checking for 165°F (74°C). Do not repeatedly cool and reheat the whole pot. Freezing is possible, but thawed cabbage and tofu tend to lose some of their original texture, so refrigeration is the better choice for this recipe.

Frequently Asked Questions

Can I make Japanese cabbage soup without dashi?
Yes. Use unsalted vegetable broth in place of the water and dashi granules. The result will still be savory, though it will not have the same seaweed or bonito character as dashi. Taste before adding the miso, since commercial broth can already contain salt. If you have kombu, you can also steep a small piece in the water while it heats, then remove it before cooking the vegetables.

Which miso is best for cabbage soup?
White miso is a good starting point because its flavor is mild enough to let the cabbage and tofu remain noticeable. Yellow miso works well too and tastes a little stronger. Red miso can be used, but it is often more intense and salty, so use less at first and adjust after tasting. Miso is stirred in off the heat whichever variety you choose.

Can I use firm tofu instead of soft tofu?
Yes. Medium-firm or firm tofu is easier to cut and will hold its shape well during stirring. Soft tofu gives the broth a more tender, delicate texture, while silken tofu is especially fragile and should be added with a spoon at the end. There is no need to press tofu for this recipe unless you specifically want a denser bite.

How do I keep the cabbage from getting mushy?
Slice it into moderately thin strips, add it after the carrot and onion have started cooking, and check it before the full 5 minutes are up. Cabbage continues to soften in hot broth, including after the pot comes off the stove, so stop cooking when it is just tender enough for your preference. Napa cabbage needs less time than dense green cabbage.

Can I prepare the soup ahead?
You can slice the vegetables and cube the tofu a day ahead, keeping them covered in the refrigerator. For the best texture, cook the soup close to serving time, or make the broth and vegetables ahead and add the tofu and miso while reheating. If you make the complete soup in advance, reheat it gently and check that it reaches 165°F (74°C); do not boil it after the miso is added.

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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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