Japanese Onion Soup Hibachi Style at Home

Japanese onion soup hibachi style is a light, savory clear soup made with onion, celery, carrots, mushrooms, and seasoned broth. It is inspired by the simple starter served at many Japanese-style teppanyaki restaurants; the exact vegetables and seasonings vary, and this easy stovetop version makes a fragrant broth without special equipment.

Ingredients

6 cups low-sodium chicken broth (1.4 L)
2 cups low-sodium beef broth (475 ml)
2 cups water (475 ml)
1 large yellow onion, peeled and quartered (about 250 g)
2 medium carrots, scrubbed and cut into large chunks (about 150 g)
2 celery stalks, cut into large chunks (about 100 g)
3 garlic cloves, lightly crushed (about 9 g)
1-inch piece fresh ginger, sliced (about 15 g)
1 tablespoon soy sauce (15 ml)
½ teaspoon kosher salt (about 3 g), plus more to taste
¼ teaspoon freshly ground black pepper (about 0.5 g)
8 ounces white button or cremini mushrooms, thinly sliced (225 g)
2 scallions, thinly sliced (about 30 g)
1 teaspoon toasted sesame oil (5 ml), optional

Instructions

Prepare the vegetables. Quarter the onion and cut the carrots and celery into large pieces; they will flavor the broth and be strained out, so there is no need to make the cuts especially neat. Lightly crush the garlic with the flat side of a knife and slice the ginger. Clean the mushrooms with a damp towel or soft brush, then slice them thinly. Keep the mushrooms and scallions separate from the vegetables destined for the broth.
Start the broth. Pour the chicken broth, beef broth, and water into a large saucepan or soup pot. Add the onion, carrots, celery, garlic, ginger, soy sauce, salt, and pepper. Set the pot over medium-high heat and bring the liquid just to a boil, which should take about 8 minutes depending on your pot and stove.
Simmer gently. As soon as the liquid boils, lower the heat so it maintains a gentle simmer rather than a rolling boil. Cook uncovered for 27 minutes. A quiet simmer helps keep the broth from becoming cloudy or reducing too quickly. If the surface develops foam, skim it off with a spoon; there is no need to stir the vegetables frequently.
Strain the soup. Set a fine-mesh strainer over a heatproof bowl or a second pot. Carefully pour the broth through it, then discard the softened onion, carrots, celery, garlic, and ginger. Return the strained broth to the pot. Taste a spoonful before adding more salt: the soy sauce and packaged broths can contribute quite a bit of salt already.
Cook the mushrooms. Bring the strained broth back to a gentle simmer, add the sliced mushrooms, and cook for 5 minutes, until tender but still holding their shape. Stir in the sesame oil if using, then taste and adjust the seasoning. If the soup tastes too concentrated, add a little hot water; if it seems mild, add soy sauce a teaspoon at a time.
Serve. Ladle the hot soup into four small bowls, dividing the mushrooms evenly. Scatter sliced scallions over each portion. Serve promptly while the broth is hot and the scallions are fresh.

Tips

Keep the simmer gentle. A hard boil can break up the vegetables and make the soup look murky. Once the pot reaches a boil, turn the heat down until you see only small, occasional bubbles. If your stove runs hot, shift the pot partly off the burner or use a smaller flame.
Choose low-sodium broth when possible. Chicken and beef broths vary in saltiness, and soy sauce adds more. Starting with low-sodium broth gives you better control. If regular broth is what you have, leave out the measured salt at first and season only after straining.
Use the large vegetables for flavor, not garnish. Cutting them into generous pieces makes them easier to remove and reduces the chance that small bits slip through the strainer. The broth vegetables have given up much of their flavor by the end, so the sliced mushrooms and fresh scallions provide the best texture in the finished bowls.
Adjust the soy sauce thoughtfully. Regular soy sauce gives a familiar savory taste. Tamari works as a substitute and is often available gluten-free, but check the label because products vary. Coconut aminos can also be used, though they are usually sweeter and less salty, so the finished soup will taste a little different.

Serving Suggestions

Serve this soup as a small first course before a meal of rice, vegetables, and grilled or pan-cooked mains. A portion of about 1½ to 2 cups makes a satisfying starter without overwhelming the rest of dinner. Set out the bowls just before eating so the scallions keep their color and the mushrooms stay pleasantly tender.

For a fuller lunch, pair a larger bowl with steamed rice, a simple cucumber salad, or a vegetable-and-tofu stir-fry. The broth is light, so it also works alongside richer dishes such as fried rice or grilled meats. If serving several courses, keep the soup warm over low heat, but avoid boiling it after the mushrooms have been added.

Variations

Make it vegetarian: Replace both broths with 8 cups (1.9 L) vegetable broth and use 2 cups (475 ml) water. Choose a savory vegetable broth rather than a strongly herb-seasoned one, which can pull the flavor away from the clean, mellow profile. Mushroom broth is another useful option and makes the soup taste deeper.

Use only one broth: If you do not have both chicken and beef broth, use 8 cups (1.9 L) of either one plus 2 cups (475 ml) water. Chicken broth makes a lighter soup; beef broth makes it more robust. You can also use 10 cups (2.4 L) of one broth and omit the water, but begin with less added salt.

Add more mushrooms: Increase the mushrooms to 12 ounces (340 g) for a more substantial bowl. Shiitake mushrooms are a flavorful alternative to button or cremini mushrooms, though their earthy taste is stronger and more distinctive. Remove and discard tough shiitake stems before slicing.

Make it gluten-free: Use tamari labeled gluten-free instead of soy sauce and check the broth labels, since some packaged broths contain ingredients with gluten. For a gentler ginger flavor, reduce the ginger to a few thin slices; for a more pronounced aromatic note, add another small slice rather than adding more soy sauce.

Storage and Reheating

Let the soup stop steaming heavily, then transfer it to a covered container and refrigerate it within 2 hours of cooking. Store it at 40°F (4°C) or colder and use it within 3 to 4 days. For the best texture, you can store the strained broth separately from the mushrooms and scallions; add fresh scallions only when serving. If the soup has been sitting out for more than 2 hours, discard it rather than saving it.

Reheat only the amount you plan to serve in a small saucepan over medium heat, stirring occasionally, until it is steaming hot throughout. For leftovers, the USDA FSIS safe minimum reheating temperature is 165°F (74°C); check with a food thermometer. Avoid prolonged boiling, which can make mushrooms soft and reduce the broth. If the refrigerated soup has thickened slightly or tastes stronger, stir in a splash of water as it reheats.

For longer storage, freeze the cooled broth in a freezer-safe container for up to 2 months for best quality, leaving a little room for expansion. Thaw it in the refrigerator, then reheat thoroughly and cook fresh mushrooms in the broth if their texture has become soft. Do not freeze the scallions as a garnish; slice fresh ones when you serve the soup.

Frequently Asked Questions

Is Japanese onion soup the same as miso soup?
No. This clear, savory soup is usually made from seasoned broth and vegetables, while miso soup is built around miso paste dissolved into broth and often includes tofu and seaweed. Both can be served with Japanese-inspired meals, but they have different flavors and textures.

Why is it called hibachi onion soup?
The name commonly refers to the clear onion soup served as a starter at Japanese-style hibachi or teppanyaki restaurants in the United States. Menus and recipes differ, so there is no single fixed ingredient list. This version uses onion, celery, carrots, mushrooms, and a blend of chicken and beef broth to create a similar-style bowl at home.

Can I make the broth ahead?
Yes. Make the broth through the straining step, cool it promptly, and refrigerate it in a covered container for up to 3 to 4 days. When ready to serve, bring it to a simmer, cook the mushrooms for 5 minutes, and finish with scallions. Keeping those final additions separate gives them a fresher texture.

How can I make the soup taste more like a restaurant version?
Use a clear, gently simmered broth and balance chicken and beef flavors rather than relying on a large amount of soy sauce. Taste after straining and season gradually; restaurant versions vary, and some are saltier or sweeter than others. Freshly sliced mushrooms and scallions added near the end also give the soup a clean finish.

Can I use homemade stock?
Yes, as long as it is strained and has a flavor you enjoy. Homemade stock can be richer or cloudier than packaged broth, so skim foam as it simmers and keep the heat low. If your stock is already salted or concentrated, dilute it with water and wait until the end to adjust the seasoning.

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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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