Japanese Chicken Udon Soup Recipe

Japanese chicken udon soup is a comforting noodle soup of thick, chewy udon, tender chicken, vegetables, and a savory dashi broth. This home-style version is inspired by Japanese udon soups, which vary by region and household, and comes together with a gentle simmer rather than a complicated stock-making process.

Ingredients

1 lb (450 g) boneless, skinless chicken thighs, left whole for cooking
6 cups (1.4 L) prepared dashi, made with instant dashi granules according to the package directions or with homemade dashi
4 packages frozen udon noodles, about 8 oz (225 g) each
5 oz (140 g) shiitake mushrooms, stems removed and caps thinly sliced
3 cups (90 g) baby spinach, loosely packed
2 medium scallions (green onions), about 1 oz (30 g), thinly sliced
1 tablespoon (15 g) fresh ginger, peeled and thinly sliced
3 tablespoons (45 ml) Japanese soy sauce
2 tablespoons (30 ml) mirin
1 tablespoon (15 ml) sake, optional
1 teaspoon (4 g) granulated sugar
¼ teaspoon (1.5 g) fine salt, plus more to taste if needed
1 tablespoon (9 g) toasted sesame seeds, for serving
1 sheet (about 2 g) nori, cut into thin strips, optional
1 teaspoon (5 ml) chili oil, optional, for serving
3 quarts (2.8 L) water, for cooking the noodles

Instructions

Prepare the ingredients. Pat the chicken dry and trim away any large pieces of excess fat, but keep the thighs whole so they stay juicy while simmering. Slice the mushrooms, ginger, and scallions, keeping the scallion greens separate for garnish. Measure the seasonings and spinach. This preparation takes about 15 minutes; keeping the toppings ready makes it easy to finish the soup promptly once the noodles are cooked.
Start the broth and noodle water. Pour the dashi into a large saucepan or Dutch oven. Stir in the soy sauce, mirin, sake if using, sugar, salt, and sliced ginger. Set the pan over medium heat and bring the liquid to a gentle simmer, which should take about 4 minutes. Meanwhile, bring the 3 quarts (2.8 L) of water to a boil in a separate pot for the udon. Using a second pot keeps the noodles’ cooking water from clouding or over-seasoning the soup.
Simmer the mushrooms and chicken. Add the sliced shiitake mushrooms to the broth and simmer for 3 minutes. Lower the chicken thighs into the broth in a single layer. Keep the liquid at a gentle simmer, not a hard boil, and cook the thighs for about 14 minutes, turning them once if they are not fully submerged. The time can vary with the thickness of the chicken. Check the thickest part of each thigh with a food thermometer; poultry must reach the USDA FSIS safe minimum internal temperature of 165°F (74°C). If a thigh has not reached that temperature, continue simmering and check again after a minute or two.
Cook the udon. While the chicken finishes, cook the frozen udon in the boiling water according to the package directions, usually about 1 to 2 minutes. Gently loosen the strands with chopsticks or tongs as they soften. Drain well. Do not leave the noodles sitting in hot water, because they will continue cooking and can become soft. If the chicken needs a few extra minutes to reach its safe temperature, the noodles can be drained and briefly rinsed with hot water just before serving.
Finish the soup. Transfer the cooked chicken to a cutting board and let it rest just long enough to handle, about 2 minutes, while the broth stays warm. Add the spinach and the white parts of the scallions to the broth; stir for about 1 minute, until the leaves wilt. Slice the chicken across the grain into bite-size pieces. Taste the broth. Add a little more soy sauce for depth or a small pinch of salt if it tastes flat, but season gradually because soy sauce and dashi vary in saltiness.
Assemble and serve. Divide the drained udon among four warm bowls. Ladle the hot broth, mushrooms, and spinach over the noodles, then arrange sliced chicken on top. Finish with the scallion greens, sesame seeds, and nori if using. Add chili oil at the table for anyone who wants heat. Serve right away, while the udon is springy and the broth is steaming.

Tips

Use a gentle simmer. A rolling boil can make chicken tougher and cause the broth to reduce too quickly. Look for small, occasional bubbles around the edges of the pan. Keep the chicken whole as it cooks, and slice it only after checking that it has reached 165°F (74°C); cutting it first makes it harder to keep the pieces tender and check their temperature reliably.
Adjust seasoning at the end. Dashi granules, soy sauces, and packaged udon can all contain different amounts of salt. The measured salt is a starting point, not a reason to add more automatically. Taste the broth after the chicken and mushrooms have simmered, then adjust a teaspoon at a time. A splash of water can soften a broth that has become too salty.
Choose a practical dashi substitute if needed. Instant dashi granules are widely available at Japanese and many Asian grocery stores; follow the package amount for 6 cups (1.4 L) of stock. If you cannot find dashi, use low-sodium chicken broth. It will make a fuller, more chicken-forward soup and will lack dashi’s distinctive sea-and-savory flavor, so taste carefully before adding salt.
Keep noodles separate until serving. Udon absorbs broth as it sits, so cooking it in the soup pot can leave you with less broth and overly soft noodles. This matters especially if you expect leftovers. Frozen udon has a pleasantly chewy texture and is convenient, but refrigerated or dried udon also works if you follow its package directions.

Serving Suggestions

Serve each bowl as a complete, warming meal, or offer small sides if you are setting out a Japanese-inspired dinner. A simple cucumber salad, lightly dressed greens, or quick-pickled vegetables bring a crisp contrast to the hot broth. Steamed rice is optional; with a full portion of udon in each bowl, it is not necessary, though a small bowl can be useful for soaking up any broth left at the end.

Set out extra sliced scallions, sesame seeds, nori, and chili oil so diners can finish their bowls to taste. For a mild, clean flavor, use just the garnishes in the recipe. For a brighter finish, add a small squeeze of lemon at the table, recognizing that it is a personal variation rather than a traditional ingredient in every udon soup. Serve the soup as soon as it is assembled: the contrast between springy noodles and hot broth is best before the noodles absorb too much liquid.

Variations

Use chicken breast: Substitute 1 lb (450 g) boneless, skinless chicken breast. Because breasts vary in thickness, begin checking the thickest part with a thermometer before the 14-minute mark and remove each piece as soon as it reaches 165°F (74°C). Slicing the breast across the grain helps keep each bite tender. Thighs are more forgiving, but either cut works.

Add other vegetables: Replace some or all of the spinach with 2 cups (about 150 g) sliced napa cabbage, or add 1 cup (100 g) thinly sliced carrots to the broth with the mushrooms. Give firmer vegetables a few extra minutes to soften before adding the chicken. Enoki mushrooms, bok choy, and snow peas are also suitable; add quick-cooking greens near the end so they do not lose their color and texture.

Make it vegetarian: Omit the chicken and use a kombu-and-shiitake dashi or another vegetarian dashi, checking that any instant stock is free of fish ingredients. Add 8 oz (225 g) firm tofu, cut into cubes, near the end to warm through. This changes the soup’s flavor and removes the chicken, but keeps the savory broth, vegetables, and udon at its center.

Make it gluten-free: Choose udon made with gluten-free ingredients and replace regular soy sauce with tamari that is labeled gluten-free. Check the dashi and mirin labels too, since packaged products can contain ingredients that do not suit every dietary requirement. Traditional wheat udon is not gluten-free, so the noodle substitution is essential rather than optional.

Storage and Reheating

For the best texture, store the broth with the chicken and vegetables separate from the cooked udon. Refrigerate everything within 2 hours of cooking, using covered, shallow containers; the soup components keep for 3 to 4 days in the refrigerator. If the noodles have already been mixed into the broth, they are still safe to store in that time, but they will soften and absorb liquid. Add a splash of water or extra dashi when reheating if the broth has become concentrated.

Reheat the broth, chicken, and vegetables in a saucepan over medium heat until steaming, stirring occasionally. Check that leftovers reach 165°F (74°C), the USDA FSIS recommended temperature for reheating leftovers. Warm noodles separately in hot water for 30 to 60 seconds, drain, and add them to the bowls; this helps restore a springier texture. You can freeze the broth and cooked chicken for up to 2 months for best quality, but freeze the noodles separately if possible. Thaw overnight in the refrigerator and reheat thoroughly. Do not leave the soup at room temperature for more than 2 hours.

Frequently Asked Questions

Can I use dried or refrigerated udon instead of frozen?
Yes. Cook dried or refrigerated udon according to its package directions, then drain it before adding it to the bowls. Cooking times differ by brand and noodle thickness, so use the package time rather than assuming the 1 to 2 minutes used for frozen udon will apply. Keep the noodles separate from the broth until you serve.

What is dashi, and can I make the soup without it?
Dashi is a Japanese stock commonly made with kombu seaweed and bonito flakes, though there are other versions, including vegetarian dashi. Instant granules are a convenient option; prepare enough for the 6 cups (1.4 L) called for here. Low-sodium chicken broth works in a pinch, but the result tastes more like a chicken soup and less like a classic dashi-based udon broth.

Can I prepare the soup ahead?
You can make the broth, cook the chicken, and prepare the vegetables a day ahead, then refrigerate them promptly in a covered container. Reheat the broth and chicken until the leftovers reach 165°F (74°C), and cook the udon just before serving. This approach saves time while preventing the noodles from soaking up the broth during storage.

Why cook udon in a separate pot?
Separate cooking keeps excess starch and any loose flour from clouding the broth, and it lets you control the noodle texture. It also makes leftovers easier to store and reheat. If you prefer a one-pot method, cook the noodles in the broth only if their package directions allow it, and expect the soup to become thicker and less clear.

How can I make the broth less salty?
First, use low-sodium dashi or broth and measure the soy sauce rather than pouring it directly into the pan. If the finished soup is too salty, add a little hot water or unsalted dashi and taste again. Avoid trying to correct it with extra sugar: sweetness may change the flavor balance without actually making the broth taste less salty.

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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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