Japanese Soup Recipe: Miso Soup with Tofu and Wakame

Japanese miso soup is a savory broth made with dashi, miso paste, and simple additions such as tofu, wakame seaweed, and scallions. This home-style version uses kombu and bonito flakes for a fragrant stock, then adds the miso off the boil for a rounded flavor; Japanese households and regions vary the ingredients and proportions.

Ingredients

5 cups (1.2 L) cold water
1 piece dried kombu, about 4 by 4 inches (10 by 10 cm; about 10 g)
1 loosely packed cup (8 g) dried bonito flakes, also called katsuobushi
7 ounces (200 g) soft or medium-firm tofu
1 tablespoon (3 g) dried wakame seaweed
1/4 cup (60 g) yellow or white miso paste, plus more to taste
2 scallions (about 30 g), thinly sliced

Kombu and bonito flakes make a classic Japanese dashi, the light stock that gives the soup its savory depth. Both are commonly available at Japanese or Asian grocery stores. If you cannot find bonito flakes, use 1 teaspoon (about 4 g) instant dashi granules in the water, following the package’s directions; the stock will be quicker and may taste saltier, so taste before adding all the miso. For a vegetarian soup, use kombu-only dashi or vegetarian dashi granules and check the label for fish ingredients. White miso is generally milder and a little sweeter than darker miso, while red miso is more robust and salty.

Instructions

Soak the kombu. Put the cold water and kombu in a medium saucepan. Leave it to soak for 15 minutes. While it soaks, cut the tofu into bite-size cubes, measure the bonito flakes and wakame, and slice the scallions. This lets the kombu begin flavoring the water without rushing the rest of the preparation.
Make the dashi. Set the saucepan over medium-low heat and warm the water for about 8 minutes, stopping just before it boils. Look for small bubbles at the edge and steam on the surface. Lift out the kombu before the water reaches a rolling boil; boiling it can make the broth cloudy or bring out a slippery texture. Add the bonito flakes, turn off the heat, and let them steep for 5 minutes.
Strain the broth. Pour the dashi through a fine-mesh strainer into a clean bowl or pot, allowing it to drain naturally for about 2 minutes. Avoid pressing the flakes hard, which can make the stock taste less clean. Discard the kombu and flakes. If you used instant dashi instead, skip the kombu and bonito steps and prepare the broth according to its label.
Warm the tofu and wakame. Return the dashi to the saucepan and set it over medium heat. Add the tofu and dried wakame, then warm gently for about 3 minutes, until the tofu is hot and the wakame has softened and expanded. Keep the broth below a vigorous boil so the tofu stays intact and the seaweed does not become overly soft.
Dissolve the miso. Turn the heat to low. Put the miso in a small bowl, ladle in about 1/2 cup (120 ml) of hot broth, and stir until smooth. Pour this mixture back into the saucepan and stir gently for about 2 minutes, just until the soup is steaming. Do not boil the soup after adding miso: high heat dulls its aroma and can make the broth taste harsh.
Finish and serve. Taste the soup before seasoning; miso varies in saltiness, so you may not need anything else. Ladle into four small bowls and top with sliced scallions. Serve promptly while hot, with tofu and seaweed distributed among the bowls.

Tips

Control the salt. Start with the listed amount of miso, then add more a teaspoon at a time if you want a fuller, saltier broth. Different brands and styles vary, and concentrated dashi granules can add salt too. A small bowl of broth is easier to adjust than trying to correct an entire pot after over-seasoning.
Keep miso from clumping. Mixing it with a little hot broth first makes it easy to incorporate evenly. A small whisk or miso strainer is useful, but a spoon and bowl work well. Avoid dropping a large spoonful straight into the pot, where it may remain in salty pockets.
Choose tofu for the texture you like. Soft tofu is delicate and traditional in many versions; medium-firm cubes are easier to handle and hold their shape. Very firm tofu works too, though it gives the soup a chewier bite. Cut the pieces evenly so they warm at about the same rate.
Watch the wakame quantity. Dried wakame swells considerably as it absorbs liquid, so a tablespoon is enough for this pot. If using salted wakame instead, rinse it well and follow the package directions; it can contribute extra salt to the broth.

Serving Suggestions

Serve miso soup as a small first course or as part of a Japanese-style meal with steamed rice, grilled fish, vegetables, or a simple omelet. The soup is savory but light, so it pairs well with dishes that have a crisp, grilled, or gently sweet element. For a more filling meal, serve a larger bowl alongside rice and add extra tofu or a few cooked vegetables. Keep the soup in small bowls when serving it with several other dishes; that makes it easier to enjoy the broth while it is hot.

Set out the scallions separately if people prefer to choose their own garnish. A few thin slices add a fresh onion flavor, but the soup is also good without them. If the rest of the meal is salty, use a little less miso and let diners add more to their individual bowls only if needed. Miso soup is usually served hot, not boiling, and it is best ladled shortly before eating so the tofu and wakame keep a pleasant texture.

Variations

Make it vegetarian. Omit the bonito flakes and steep the kombu in the water for a mild vegetarian stock. For a little more savory depth, use a vegetarian dashi product that contains no fish, checking its ingredients carefully. The result will taste cleaner and less smoky than bonito dashi, but tofu, mushrooms, and miso make a satisfying bowl.

Add vegetables. Thinly sliced daikon, carrot, or mushrooms can go into the dashi before the tofu; simmer until tender, allowing extra time depending on how thickly they are cut. Spinach or sliced greens need only a brief wilt near the end. These are flexible home-style additions, not a fixed list: use one or two vegetables so the broth still tastes clear.

Change the miso. White miso gives a mellow soup, while red or mixed miso makes a deeper, saltier broth. If using a stronger miso, begin with 3 tablespoons (about 45 g), taste, and add more gradually. You can also combine two kinds, as long as you taste before adding the full amount.

Use clams or mushrooms. Small clams are a common variation in some preparations; add them to the dashi and cook until their shells open, discarding any that remain closed. Because shellfish safety and cooking depend on the specific product, follow the package or local food-safety guidance and do not rely on appearance alone for other seafood. For an easy meat-free alternative, add thinly sliced shiitake or enoki mushrooms and cook until tender.

Storage and Reheating

Cool leftovers promptly and refrigerate within 2 hours in a covered container. The soup keeps for 3 to 4 days in the refrigerator. The wakame will continue to soften and the tofu may lose some of its delicate texture, so for the best result you can store leftover dashi separately from the tofu and seaweed, then assemble portions when reheating. If the soup has already been combined, it is still fine to store and reheat as directed.

Warm only the amount you plan to eat in a saucepan over medium-low heat, stirring gently. Reheat leftovers to 165°F (74°C), checking with a food thermometer, and avoid boiling them hard. Miso aroma can fade with repeated heating, so add a small spoonful of fresh miso dissolved in hot broth after reheating if the flavor seems muted. Discard soup left at room temperature for more than 2 hours, and do not repeatedly cool and reheat the same pot.

Frequently Asked Questions

Is miso soup the same as Japanese soup? Miso soup is one of Japan’s best-known soups, but Japanese cooking includes many other soups and broths. This recipe is specifically a tofu-and-wakame miso soup with dashi. Ingredients and seasoning vary by household and region, so this is a useful everyday version rather than a claim to one definitive formula.

Can I make the soup without bonito flakes? Yes. Use kombu-only dashi for a vegetarian broth, or use vegetarian instant dashi according to its package. Without bonito, the soup loses some of the classic stock’s savory, lightly smoky character, but it remains flavorful. Check instant-dashi labels because some products contain fish even if the package looks similar to vegetarian stock.

Can I use instant dashi instead of making stock? Yes. It is a convenient substitute and saves the time needed to soak and steep kombu and bonito. Follow the product’s water ratio, then add tofu and wakame and finish with miso as directed. Since granules can be salty or concentrated, taste the broth before mixing in the full amount of miso.

Why shouldn’t miso soup boil? Miso is fermented seasoning with a delicate aroma. A hard boil after it is added can flatten that aroma and make the soup taste less rounded. Warm the dashi and other ingredients first, lower the heat, then dissolve the miso and serve once the soup is steaming. If it accidentally bubbles briefly, it is still edible, though the flavor may be less fragrant.

Can I prepare the dashi ahead? Yes. Strain the dashi, cool it promptly, and refrigerate it in a covered container for up to 3 days. When ready to serve, heat the stock with tofu and wakame, then dissolve in the miso near the end. Keeping the miso out until reheating helps preserve its aroma and makes it easier to adjust the seasoning.

What can I use if I cannot find wakame? Leave it out or add a small amount of another quick-cooking vegetable, such as thinly sliced spinach or mushrooms. The flavor and texture will differ, but the soup will still work. Avoid replacing dried wakame one-for-one by volume with fresh seaweed, since dried seaweed expands as it rehydrates.

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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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