Substitute for Cornstarch in Stir Fry: A Simple Sauce

Arrowroot powder is a dependable substitute for cornstarch in stir-fry sauce: use the same amount, whisk it with cold water, and add it near the end of cooking. This quick chicken and vegetable stir-fry shows how to make a glossy sauce that clings to the ingredients, with easy alternatives if arrowroot is not in your pantry.

Ingredients

1 lb boneless, skinless chicken breast (450 g), cut into bite-size pieces about ¾ inch (2 cm) across
1 tablespoon neutral oil, such as canola or avocado oil (15 ml), plus 1 teaspoon (5 ml) if needed
1 medium red bell pepper (about 6 oz/170 g), thinly sliced
2 cups broccoli florets (about 180 g), cut into small, similar-size pieces
1 medium carrot (about 3 oz/85 g), thinly sliced on the diagonal
3 scallions (about 30 g), thinly sliced, with white and green parts separated
2 garlic cloves (about 6 g), finely chopped
1 tablespoon finely grated fresh ginger (about 6 g)
¼ cup reduced-sodium soy sauce (60 ml)
½ cup low-sodium chicken broth or water (120 ml)
1 tablespoon rice vinegar (15 ml)
1 tablespoon honey (21 g)
1 teaspoon toasted sesame oil (5 ml)
1 tablespoon arrowroot powder (about 8 g)
2 tablespoons cold water (30 ml), for the arrowroot slurry
¼ teaspoon ground black pepper (about 0.5 g)
4 cups cooked rice for serving (about 600 g; approximately 1⅓ cups/250 g uncooked rice, prepared according to its package)
1 tablespoon toasted sesame seeds (about 9 g), optional garnish

Instructions

Prepare the ingredients and sauce (20 minutes). Cut the chicken and vegetables before heating the pan; stir-frying moves quickly once it starts. In a small bowl, mix the soy sauce, broth, rice vinegar, honey, sesame oil, and black pepper. In a separate small cup, whisk the arrowroot powder into the cold water until smooth. Keep the slurry separate for now, because arrowroot thickens best when stirred into the hot liquid near the end. Have the rice ready to serve; if you are cooking it from dry, start it before the stir-fry so it is done on time.
Brown the chicken (6 minutes). Heat a large wok or 12-inch (30 cm) skillet over medium-high to high heat. Add the oil and swirl to coat the cooking surface. Add the chicken in a single layer, working in two batches if the pan is crowded; cook about 3 minutes per batch, turning the pieces so they brown on more than one side. Return all the chicken to the pan if you cooked it in batches. Check the thickest pieces with a food thermometer: USDA FSIS safe minimum temperature for poultry is 165°F (74°C). If any pieces have not reached that temperature, keep cooking and check again before adding the vegetables.
Cook the vegetables and aromatics (4 minutes). Add the broccoli, carrot, and bell pepper. Stir-fry for about 3 minutes, tossing frequently, until the broccoli is bright green and the vegetables are crisp-tender. Add the scallion whites, garlic, and ginger and stir for 1 minute, just until fragrant. If the pan looks dry or the garlic starts to catch, add a small splash of water rather than more oil.
Thicken the sauce (2 minutes). Stir the arrowroot slurry again, since the powder settles quickly. Pour the soy mixture into the pan, then immediately add the slurry while stirring. Let the sauce bubble gently for 1 to 2 minutes, tossing the chicken and vegetables so they are evenly coated. Take the pan off the heat as soon as the sauce looks glossy and lightly thickened; arrowroot can become thin or stringy if it is boiled hard for too long.
Finish and serve. Scatter over the scallion greens and sesame seeds, if using. Spoon the stir-fry over the cooked rice and serve while the sauce is hot. If the sauce thickens more than you like as it stands, toss in a tablespoon of warm water at a time until it loosens.

Tips

Match the substitute to the sauce. Arrowroot is a useful one-for-one replacement for cornstarch in this recipe and makes a clear, shiny sauce. Tapioca starch can also be used in the same amount, though its finish may be slightly chewier. Potato starch works as well; stir it in at the end and avoid a prolonged boil. These starches are not identical in texture, so add a little more slurry only if the sauce remains too thin.
Make a smooth slurry. Mix starch with cold water before it touches the hot pan. Adding dry powder straight to hot sauce can leave stubborn lumps. Starches settle while they wait, so give the cup another stir immediately before pouring it in.
Keep the pan hot, but control the sauce. Cook the chicken and vegetables over high heat for quick browning, then reduce the heat slightly if the sauce boils vigorously. Arrowroot is especially sensitive to extended high heat. A gentle bubble for a short time is enough to thicken it.
Do not crowd the pan. A crowded skillet releases moisture and steams the chicken instead of browning it. If your pan is small, brown the chicken in batches and remove it briefly while the vegetables cook, then return it before adding the sauce. Cut the vegetables to a similar size so they finish at roughly the same time.

Serving Suggestions

Serve the chicken and vegetables over steamed jasmine or long-grain rice, which catches the savory sauce. Brown rice is another option, though its firmer texture makes the meal heartier. For a lighter-feeling plate, serve the stir-fry with extra broccoli or shredded cabbage and a smaller scoop of rice. Rice noodles can stand in for rice; cook them according to their package directions, drain well, and toss them with the finished stir-fry just before serving.

A simple side of sliced cucumber or lightly dressed greens gives the meal a cool, fresh contrast. Set out extra sliced scallions, sesame seeds, or chili crisp so diners can season their own portions. The soy-based sauce is already savory, so taste before adding extra soy sauce or salt at the table.

Variations

Use a different protein: Thinly sliced pork or beef can replace the chicken, but cook it until done and check the thickest pieces with a thermometer. Whole cuts of beef and pork should reach the USDA FSIS safe minimum of 145°F (63°C), followed by a 3-minute rest. For shrimp or firm fish pieces, cook separately until fish reaches 145°F (63°C), then add them back with the sauce so they do not overcook. For tofu, use about 14 oz (400 g) firm tofu, patted dry and cubed; brown it first, then set it aside and return it to the pan at the sauce stage.

Change the vegetables: Snow peas, sliced mushrooms, green beans, zucchini, or napa cabbage can replace the pepper, broccoli, or carrot. Keep the total amount close to 4 cups (about 450 g) and adjust cooking time according to how quickly each vegetable softens. Add quick-cooking greens near the end rather than giving them the full time in the pan.

Adjust the flavor: For a little heat, add ½ teaspoon (about 1 g) red pepper flakes with the garlic, or serve chili sauce on the side. Use maple syrup instead of honey in the same amount for a different sweetness. Tamari can replace soy sauce in equal volume; check its label because salt levels vary. If using coconut aminos, start with less honey and taste the sauce, since coconut aminos are typically sweeter and less salty than soy sauce.

Try another thickener: If arrowroot is unavailable, use 1 tablespoon (about 8 g) tapioca starch or potato starch mixed with 2 tablespoons (30 ml) cold water. All-purpose flour is a less direct substitute: it can make the sauce cloudy and may taste floury unless cooked longer, so it is not the best choice for a quick, clear stir-fry glaze. For a flour-based option, whisk 2 tablespoons (16 g) flour with 3 tablespoons (45 ml) cold water and simmer the sauce gently for several minutes, stirring until the flour taste cooks out.

Storage and Reheating

Refrigerate leftovers within 2 hours of cooking, placing them in a shallow, covered container so they cool promptly. Store the rice separately from the stir-fry when possible; this helps the vegetables retain their texture and makes it easier to reheat each part evenly. The cooked chicken and vegetables keep for 3 to 4 days in the refrigerator. The sauce may loosen or become a little less glossy after chilling, which is normal for a starch-thickened sauce.

Reheat only the portion you plan to eat in a skillet over medium heat with a splash of water or broth, stirring until steaming hot throughout. Alternatively, microwave in a covered, microwave-safe dish, stirring partway through so there are no cool spots. Leftovers should reach 165°F (74°C) when reheated, measured with a food thermometer. If the sauce becomes too thin, simmer it briefly; if it becomes too thick, add warm water a tablespoon at a time. Freezing is possible for up to about 2 months, but the vegetables may soften and the sauce may separate slightly after thawing. Thaw in the refrigerator and reheat thoroughly.

Frequently Asked Questions

What is the best substitute for cornstarch in stir-fry sauce?

Arrowroot powder is a convenient choice when you want a glossy, fairly clear sauce. Use the same amount as the cornstarch called for, whisked with cold water, and add it after the other sauce ingredients are hot. Tapioca starch and potato starch are also practical options, though their texture can vary slightly. The exact result depends on the brand and the amount of liquid in the pan.

Can I use flour instead of cornstarch?

Yes, but flour makes a more opaque sauce and generally needs a longer simmer to lose its raw taste. It is not a direct one-for-one swap by weight: a common starting point is about twice as much flour as cornstarch. Whisk it thoroughly with cold water before adding it, and simmer gently while stirring. For the bright, quick glaze in this recipe, arrowroot or another starch is easier to manage.

Can I add arrowroot directly to the sauce?

It is better to make a slurry first. Dry arrowroot can form lumps as soon as it hits hot liquid, while mixing it with cold water disperses it smoothly. Stir the slurry just before using it because the powder settles to the bottom. Pour it into the hot sauce while stirring, then cook only until the sauce thickens.

Why did my stir-fry sauce turn thin again?

Arrowroot can lose some of its thickening power if it is boiled hard or cooked for a long time. Too much liquid from crowded vegetables can also dilute the sauce. Take the pan off the heat once the sauce is glossy and lightly thickened. If it is already thin, briefly simmer it gently; if needed, mix a small additional amount of arrowroot with cold water before adding it.

Can I make the sauce ahead?

You can mix the soy sauce, broth, vinegar, honey, and sesame oil up to 2 days ahead and keep the mixture covered in the refrigerator. Make the arrowroot slurry just before cooking rather than storing it, because the powder settles and does not stay evenly suspended. For the best texture, cook the vegetables and chicken close to serving time, then thicken the sauce in the pan.

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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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