Curry Udon Ingredients and a Simple Japanese Noodle Recipe

Curry udon is a Japanese noodle soup that combines chewy udon with a savory, gently thick curry broth, often made with Japanese curry roux and dashi. This meatless version adds onion, carrot, and shiitake mushrooms for a satisfying one-bowl meal, and its ingredients are easy to adjust to your pantry. Curry udon has many home-style variations, so use the broth and toppings you enjoy.

Ingredients

4 portions frozen udon noodles (about 7 oz / 200 g each; 28 oz / 800 g total). Frozen udon is usually thick and pleasantly chewy; use the package directions to heat it.
4½ cups dashi stock or vegetable broth (1.06 L). Dashi gives the broth a classic Japanese savory flavor. Choose kombu-based dashi or vegetable broth to keep the dish vegetarian; standard bonito dashi is made with fish.
1 tablespoon neutral oil (15 ml), such as canola or vegetable oil.
1 medium yellow onion (about 6 oz / 170 g), peeled and thinly sliced.
1 medium carrot (about 3½ oz / 100 g), peeled and cut into thin half-moons.
4 oz shiitake mushrooms (115 g), stems removed and caps sliced. Cremini mushrooms are an easy substitute, though their flavor is milder.
3½ oz Japanese curry roux (100 g), broken into small pieces. The exact number of cubes varies by brand and package, so weigh or measure the roux rather than relying only on cube count.
1 tablespoon soy sauce (15 ml), preferably Japanese-style soy sauce.
1 tablespoon mirin (15 ml). If you do not have mirin, use 2 teaspoons (10 ml) water plus 1 teaspoon (5 ml) sugar; the flavor will be less rounded.
1 teaspoon sugar (4 g), optional, to balance a particularly salty or sharp curry roux.
1 tablespoon cornstarch (8 g) mixed with 2 tablespoons cold water (30 ml), optional. Use this only if you want a thicker broth after the roux has dissolved.
2 scallions (about 1 oz / 30 g), thinly sliced, for serving.
¼ teaspoon shichimi togarashi (about 0.5 g), optional, for a warm, peppery finish.

Instructions

Prepare the vegetables, about 15 minutes. Slice the onion, carrot, mushrooms, and scallions. Break the curry roux into small pieces so it melts evenly. Set a large pot of water over high heat for the noodles; you will cook the udon while the broth simmers. Check the udon package because frozen and shelf-stable noodles can have different heating times.
Soften the vegetables, 6 minutes. Heat the oil in a large saucepan or Dutch oven over medium heat. Add the onion and cook for 4 minutes, stirring occasionally, until it begins to soften and turn translucent. Add the carrot and shiitake mushrooms and cook for 2 minutes more. Avoid browning the onion deeply; a gentle sauté keeps the broth sweet and mellow.
Simmer the broth and vegetables, about 10 minutes. Pour in the dashi or vegetable broth and bring it to a gentle simmer, which should take about 2 minutes. Lower the heat enough to maintain a steady simmer and cook for 8 minutes, until the carrot is nearly tender when pierced with a fork. If the broth boils hard, reduce the heat so it does not evaporate too quickly.
Dissolve the curry roux, 4 minutes. Turn the heat to low. Add the roux pieces a few at a time, stirring until each addition has dissolved before adding more. Stir in the soy sauce, mirin, and optional sugar. Let the broth simmer gently for about 4 minutes, stirring often, until smooth and lightly thickened. Do not let it boil vigorously, since thick curry broth can bubble and splatter.
Heat the udon while the broth finishes. When the water boils, add the frozen udon and loosen the strands with chopsticks or tongs. Cook according to the package, usually about 1 to 2 minutes for frozen udon, just until hot and separated. Drain well. If the noodles finish first, rinse them briefly with hot water and keep them covered so they stay warm.
Adjust the consistency and seasoning, about 2 minutes. If you prefer a thicker soup, stir the cornstarch and cold water together until smooth, then drizzle in half while stirring. Simmer for 1 minute and add more slurry only if needed. Taste the broth before adding extra soy sauce or salt because curry roux can already be quite salty.
Assemble and serve, about 1 minute. Divide the hot udon among four bowls and ladle the curry broth and vegetables over the noodles. Finish with scallions and, if desired, a small pinch of shichimi togarashi. Serve immediately while the noodles are springy and the broth is hot.

Tips

Choose the right dashi for your needs. Kombu dashi is made with kelp and suits a vegetarian bowl; some instant dashi powders contain bonito or other fish, so read the label if avoiding fish. Vegetable broth works well too, though the soup will taste less distinctly Japanese. If using a strongly flavored broth, choose a milder curry roux and taste before adding more soy sauce.
Make the roux dissolve smoothly. Lower the heat before adding it and stir gradually. Japanese curry roux contains a thickener and can clump if dropped into rapidly boiling liquid. If a few small lumps remain, press them against the side of the pot with the back of a spoon, then stir until smooth.
Keep noodles separate until serving. Udon continues to absorb liquid as it sits in curry broth. Cooking and draining it separately protects its texture and makes leftovers easier to store. If serving a group, put noodles in bowls first and add broth at the table rather than leaving all four portions in the pot.
Check the roux ingredients and salt level. Curry blocks commonly contain wheat and may contain dairy, so check the package for allergies. Roux strengths and salt levels differ; start with the stated amount, then adjust gradually. For a gluten-free meal, use a clearly labeled gluten-free curry roux and tamari instead of standard soy sauce.

Serving Suggestions

Serve curry udon as a complete meal in wide, deep bowls, with extra broth poured over the noodles just before eating. Scallions add freshness, while shichimi togarashi gives the mild, savory soup a little heat. A small side of Japanese pickles, such as takuan or cucumber pickles, offers a crisp, tangy contrast. Steamed greens or a simple cucumber salad also fit without competing with the curry.

If you want a more filling spread, offer rice on the side for anyone who would like to spoon up the remaining curry broth. Keep the rice separate rather than adding it to the noodle pot, since both rice and udon soak up liquid quickly. Provide chopsticks and a soup spoon: chopsticks are useful for the noodles, and the spoon makes it easier to enjoy the broth and small pieces of vegetable.

Variations

Add tofu or fried tofu. For extra substance, add 7 oz (200 g) firm tofu, drained and cut into cubes, with the broth. Let it warm through during the vegetable simmer. For a more traditional-style topping, use 1 sheet aburaage (about 1 oz / 30 g), sliced into strips; this Japanese fried tofu pouch is available at many Asian grocery stores. If you cannot find it, firm tofu works, though it is less rich and does not have aburaage’s porous texture.

Make it richer with meat. Thinly sliced beef or pork is common in some versions. Brown 8 oz (225 g) thinly sliced meat in the pot after softening the onion, then continue with the broth and vegetables until the meat is cooked through. For whole-cut beef or pork, follow USDA FSIS guidance: use a food thermometer to confirm a safe minimum internal temperature of 145°F (63°C), followed by a 3-minute rest. Keep in mind that meat cooked in broth can be difficult to check accurately; use slices thick enough to measure, or choose a meatless version if you cannot verify the temperature.

Adjust the heat and sweetness. Use a hot curry roux for a spicier bowl, or stir in a little chili oil at serving. For a sweeter, rounder flavor, add the optional teaspoon of sugar or include ½ a peeled apple (about 3 oz / 85 g), grated into the broth as it simmers. The apple softens into the sauce and adds gentle fruitiness.

Use curry powder if you cannot find Japanese roux. The result will not have quite the same thick, rounded flavor, but it can still make a good noodle soup. Stir 2 tablespoons (16 g) curry powder into the softened vegetables, then add 2 tablespoons (28 g) butter and 2 tablespoons (16 g) flour, stirring for 1 minute before adding the broth gradually. Simmer until thickened, then season to taste. This substitute contains wheat and dairy unless you choose suitable alternatives.

Storage and Reheating

For the best texture, store the udon and curry broth separately in airtight containers. Refrigerate them within 2 hours of cooking; the broth keeps for 3 to 4 days, and cooked noodles are best used within 2 to 3 days. If the noodles have already been sitting in the broth, refrigerate the mixture promptly and use it within 3 to 4 days, knowing that the udon will soften as it absorbs liquid.

Reheat the broth in a saucepan over medium-low heat, stirring often. Add a splash of water or broth if it has thickened in the refrigerator. Reheat leftovers to 165°F (74°C), as measured with a food thermometer. Warm separately stored udon in boiling water for about 30 seconds to 1 minute, or follow its package directions, then drain and pour the hot broth over it. Avoid repeatedly cooling and reheating the same portion. Freeze broth without noodles for up to 2 months for best quality; thaw it in the refrigerator before reheating. Freezing the noodles is not recommended because their texture can become soft.

Frequently Asked Questions

What is the difference between curry udon and curry rice?

Both use Japanese-style curry, but curry udon serves a curry-seasoned broth with thick wheat noodles, while curry rice is a thicker sauce spooned over rice. Curry udon broth is often loosened with dashi and may be seasoned with soy sauce or mirin. This recipe uses curry roux for a convenient, consistent base.

Can I use dried or shelf-stable udon instead of frozen?

Yes. Cook dried udon in a separate pot according to its package directions, then drain it well before serving with the broth. Shelf-stable vacuum-packed udon may need only a short boil or rinse in hot water. Avoid cooking either kind directly in the curry broth, because released starch can make the soup gummy and the noodles may absorb too much liquid.

Can I make curry udon without Japanese curry roux?

Yes. The curry-powder, butter, and flour option in the variations section makes a workable substitute. It tastes less rounded than packaged Japanese curry roux, which typically includes spices, fat, and thickener in one block. Adjust the seasoning gradually, and simmer until the broth reaches a consistency that clings lightly to the noodles.

How can I make the broth less salty?

Use unsalted or low-sodium broth, and do not add extra soy sauce until you have tasted the finished soup. If the broth is already too salty, add a little hot water or unsalted broth and simmer briefly. Adding more noodles or vegetables can also balance the bowl, but it will make more servings and dilute the curry flavor.

Can I prepare the broth ahead?

Yes. Make the broth and vegetables up to 3 days ahead, cool and refrigerate them promptly, then reheat to 165°F (74°C) before serving. Cook the udon fresh or heat it separately at serving time for a springier texture. If the chilled broth has thickened, stir in a little water while reheating until it is pourable again.

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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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