Thai One On Soup Recipe with Chicken and Rice Noodles

Thai One On soup is a Thai-inspired chicken noodle soup with a fragrant coconut broth, mushrooms, lime, and fresh herbs. It brings together savory, spicy, sour, and lightly sweet flavors in a satisfying bowl, without claiming to be a traditional Thai soup with one fixed recipe.

Ingredients

6 oz (170 g) thin rice noodles
1 tbsp (15 ml) neutral oil, such as canola oil
1 small yellow onion, thinly sliced, about 4 oz (110 g)
3 garlic cloves, minced, about 1 tbsp (9 g)
1 tbsp (15 g) finely grated fresh ginger
1 stalk lemongrass, about 1 oz (25 g), tough outer layers removed and tender center finely chopped
2 tbsp (30 g) Thai red curry paste, or more to taste
4 cups (950 ml) low-sodium chicken broth
1 can coconut milk, 13.5 oz (400 ml), well shaken
1 lb (450 g) boneless, skinless chicken thighs, cut into bite-size pieces
8 oz (225 g) cremini or button mushrooms, thinly sliced
1 medium red bell pepper, thinly sliced, about 5 oz (150 g)
3 makrut lime leaves, lightly torn, optional
1½ tbsp (22 ml) fish sauce
1 tsp (4 g) brown sugar
½ tsp (3 g) fine salt, plus more as needed
2 tbsp (30 ml) fresh lime juice, plus lime wedges for serving
½ cup (15 g) chopped fresh cilantro
½ cup (10 g) Thai basil leaves, torn, or regular basil if Thai basil is unavailable
1 small red chile, thinly sliced, optional

Instructions

Prepare the ingredients. Slice the onion, mushrooms, and pepper; mince the garlic; grate the ginger; and chop the tender lemongrass center very finely. Cut the chicken into pieces of similar size so they cook evenly. If using makrut lime leaves, tear them once or twice to release their aroma. Set out the lime juice, fish sauce, sugar, herbs, and noodles so they are ready when the soup is nearly done.
Soften the aromatics. Heat the oil in a large, heavy pot over medium heat. Add the onion and cook for 2 minutes, stirring, until it begins to soften. Add the garlic, ginger, and lemongrass and cook for about 1 minute, stirring often. Stir in the curry paste and cook for 1 minute more, until fragrant. Keep the heat moderate: scorching the garlic or curry paste can make the broth taste bitter.
Build the coconut broth. Pour in the chicken broth and coconut milk, scraping the bottom of the pot to loosen any curry paste. Add the makrut lime leaves, fish sauce, brown sugar, and salt. Bring the liquid just to a gentle simmer, then lower the heat and simmer uncovered for 8 minutes. Avoid a hard boil, which can make coconut milk separate and leave the soup greasy-looking; a gentle simmer keeps the broth smooth.
Cook the chicken and vegetables. Add the chicken and mushrooms to the pot. Keep the broth at a gentle simmer for 15 minutes, stirring once or twice. Add the sliced bell pepper during the final 5 minutes so it softens but keeps some bite. Check the thickest chicken pieces with a food thermometer; the USDA FSIS safe minimum internal temperature for poultry is 165°F (74°C). If a piece has not reached that temperature, continue simmering and check again. While the chicken cooks, prepare the rice noodles according to their package directions, usually by soaking or boiling them for about 5 minutes, then drain them well.
Balance the flavor. Remove the pot from the heat. Stir in the lime juice and taste the broth. Add a little more fish sauce for savory depth, lime juice for a sharper finish, sugar if it tastes too tart, or salt if the flavors seem muted. If you want more heat, add sliced chile or a small extra spoonful of curry paste dissolved in a ladleful of hot broth.
Serve the bowls. Divide the drained noodles among four bowls and ladle the hot chicken, vegetables, and coconut broth over them. Finish with cilantro and Thai basil. Serve lime wedges at the table so everyone can adjust the sourness to taste.

Tips

Choose a curry paste you can season around. Thai red curry pastes vary in saltiness and heat, and some contain shrimp paste. Start with 2 tablespoons, especially if the brand is unfamiliar, then adjust after the broth simmers. If you need a seafood-free option, check the label and choose a paste made without shrimp; the flavor may be less complex, so taste and season carefully.
Use a practical substitute for hard-to-find ingredients. Lemongrass gives the broth a fresh citrus-floral note; if you cannot find it, add 1 teaspoon (2 g) finely grated lime zest with the ginger. Makrut lime leaves are optional and can be left out, or replaced with a little extra lime zest. Neither substitute tastes exactly the same, but both keep the broth bright. Remove any large lemongrass pieces or lime leaves before serving.
Season after the lime goes in. Fish sauce, curry paste, and broth all contribute salt, while lime changes how salty and rich the soup seems. Add the listed amount first, then taste at the end before adding more. If the broth feels too rich, a squeeze of lime usually helps; if it tastes flat, a small addition of fish sauce or salt may be what it needs.
Keep noodles separate if you expect leftovers. Rice noodles continue absorbing broth after cooking and can become soft in storage. For a meal served right away, put noodles directly in each bowl; for meal prep, store them in their own container and portion them into bowls when reheating.

Serving Suggestions

Serve this soup hot as a complete weeknight dinner: the chicken supplies the main protein, and the noodles make the broth filling. Put lime wedges, extra herbs, and sliced chile on the table so people can finish their own bowls. A small dish of extra fish sauce can be offered for those who prefer a saltier, more savory taste, but add it a little at a time.

If you would like a larger meal, serve the soup with a simple cucumber salad, steamed greens, or a plate of fresh vegetables. Keep sides lightly seasoned so they do not compete with the broth. A small serving of jasmine rice can be offered instead of noodles, or alongside the soup for anyone who prefers a softer, more substantial accompaniment. For a shared meal, bring the pot to the table and ladle the soup over noodles in individual bowls just before serving.

Variations

Make it vegetarian. Replace the chicken broth with vegetable broth, omit the chicken and fish sauce, and add 14 oz (400 g) firm tofu cut into cubes. Use 1 tablespoon (15 ml) soy sauce or tamari in place of the fish sauce, then adjust to taste. Check the curry paste label because some pastes contain shrimp. Add the tofu during the final 5 minutes, just long enough to heat through; the broth will be lighter and more vegetable-forward.

Use shrimp instead of chicken. Replace the chicken with 12 oz (340 g) peeled, deveined shrimp. Simmer the broth and mushrooms first, then add the shrimp for the final few minutes, until opaque and firm. Check the thickest shrimp with a food thermometer and cook seafood to the USDA FSIS safe minimum internal temperature of 145°F (63°C). Shrimp cook quickly, so avoid adding them with the chicken or they can turn rubbery.

Adjust the heat or richness. For a milder soup, use 1 tablespoon (15 g) curry paste and omit the fresh chile; add more paste at the end if wanted. For extra heat, add chile gradually rather than increasing the curry paste by a large amount, since paste also adds salt and other seasonings. For a lighter broth, use 1 cup (240 ml) coconut milk and increase the chicken broth by ½ cup (120 ml); the result will be less creamy but still aromatic.

Swap the noodles. Wide rice noodles work well, though they may need a longer soak or cook than thin noodles. Follow the package instructions rather than relying on a fixed time, and drain them before portioning. If using cooked wheat noodles, prepare them separately and rinse briefly if they are very starchy. You can also skip noodles and serve the soup over rice, but keep rice separate until serving so it does not thicken the broth in the pot.

Storage and Reheating

For food safety, refrigerate the soup within 2 hours of cooking. Cool it in shallow containers so it chills more quickly, and store the broth, chicken, and vegetables separately from the noodles when practical. Refrigerated soup keeps for 3 to 4 days. Rice noodles are best within about 2 days because their texture softens as they sit, so cook a fresh portion if you want a firmer noodle in later bowls.

Reheat only the portion you plan to eat in a saucepan over medium-low heat, stirring gently until steaming throughout. Check that leftovers reach 165°F (74°C), the USDA FSIS safe temperature for reheated food. Avoid a vigorous boil, which can cause the coconut milk to separate; whisk gently if the broth looks slightly divided. Add a splash of broth or water if it has thickened, then taste and refresh with lime juice or herbs. Microwave individual portions in a covered, microwave-safe bowl, stirring partway through and checking the temperature in more than one spot.

For longer storage, freeze the broth with chicken and vegetables, preferably without noodles, for about 2 to 3 months for best quality. Leave room in the freezer container for expansion. Thaw overnight in the refrigerator, reheat to 165°F (74°C), and cook or prepare noodles separately. Coconut milk may look a little grainy after freezing; gentle stirring as the soup warms usually brings the broth back together.

Frequently Asked Questions

Is Thai One On soup an authentic Thai dish?

This recipe is Thai-inspired rather than a claim to a single traditional Thai soup. Its coconut milk, curry paste, lime, fish sauce, and herbs draw on flavors used in Thai cooking, but home recipes and regional preparations vary. It is best thought of as a flexible coconut chicken noodle soup with Thai-style seasoning.

Can I make the soup ahead of time?

Yes. Cook the broth, chicken, and vegetables up to 3 days ahead and refrigerate them promptly. Prepare the noodles separately, ideally close to serving time, then reheat the soup gently and cook or warm the noodles according to their package directions. Add fresh lime juice and herbs at the end for a brighter finish.

Why does my coconut broth look separated?

Coconut milk can separate if it boils hard, and some brands naturally look less smooth than others. Keep the soup at a gentle simmer rather than a rolling boil, and stir it as it warms. If it separates, take the pot off the heat and whisk gently; the appearance may improve even if it does not become perfectly uniform.

Can I use chicken breast instead of thighs?

Yes. Cut boneless, skinless chicken breast into evenly sized bite-size pieces and add it in the same step. Breast meat can dry out sooner than thighs, so begin checking it before the full 15 minutes have passed and remove it from the heat once the thickest pieces reach 165°F (74°C). The USDA FSIS safe minimum temperature for poultry still applies.

How can I make the broth less spicy?

Use 1 tablespoon of curry paste to start and leave out the fresh chile. You can add more curry paste after tasting, but reducing the initial amount is easier than trying to remove heat later. Extra coconut milk or broth can mellow the spice, though you may need to add a little more lime, fish sauce, or salt afterward to restore balance.

What can I use instead of fish sauce?

For a quick substitute, use soy sauce or tamari in the same amount, then taste before adding the full listed salt. The soup will lose some of fish sauce’s distinctive savory depth, but the other aromatics still make a flavorful broth. For a vegetarian version, choose a soy-based substitute and confirm that the curry paste is also free of seafood ingredients.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).