Mongolian beef is an American Chinese restaurant-style stir-fry of thinly sliced beef in a glossy sauce made with soy, brown sugar, garlic, and ginger, usually served over rice. The flavor is sweet, savory, and gently aromatic, while a quick sear gives the beef browned edges without making the slices tough.
Despite its name, this takeout favorite is not a traditional dish from Mongolia; restaurant and home versions vary in sweetness, heat, and how crisp the beef becomes. This version keeps the sauce balanced and makes the cooking order easy to follow in a home skillet.
Ingredients
- 1¼ lb flank steak (570 g), trimmed of any thick surface membrane
- ⅓ cup (80 ml) low-sodium soy sauce
- ½ cup (120 ml) water
- ⅓ cup packed light brown sugar (67 g)
- ⅓ cup cornstarch (40 g), for coating the beef
- 1 tbsp cornstarch (8 g), for thickening the sauce
- ¼ cup (60 ml) neutral high-heat oil, such as canola or avocado oil, divided
- 1 tbsp finely grated fresh ginger (about 10 g)
- 3 garlic cloves, finely minced (about 1 tbsp or 9 g)
- 4 scallions (about 60 g), cut into 2-inch (5 cm) lengths, with white and green parts separated
- ¼ tsp red pepper flakes (about 0.5 g), optional
- 1 tsp toasted sesame oil (5 ml), optional
- Cooked rice, for serving
Instructions
- Slice the beef. Pat the steak dry, then cut it across the grain into strips about ¼ inch (6 mm) thick and 2 to 3 inches (5 to 7.5 cm) long. If the steak feels soft and difficult to slice, chill it in the freezer for 15 to 20 minutes before cutting; this optional pause is not included in the recipe timing, so allow extra time if you use it. Cutting across the grain shortens the muscle fibers and helps each piece feel tender.
- Mix the sauce and prepare the coating. Whisk the soy sauce, water, brown sugar, and the 1 tablespoon (8 g) cornstarch in a small bowl until the starch is dispersed. Put the ⅓ cup (40 g) cornstarch in a separate shallow dish. Pat the beef dry once more if needed, then toss it in the starch until the pieces have a thin, even coating. Shake off loose excess so it does not fall into the oil and burn.
- Heat the pan. Set a large, heavy skillet or wok over medium-high heat. Add about 1 tablespoon (15 ml) of the oil and heat it for roughly 2 minutes, until it shimmers but is not smoking. Have a plate and the prepared sauce close by; the next steps move quickly.
- Sear the beef in batches. Arrange the strips in one layer without crowding the pan. Cook each batch for about 2 minutes, turning once, until the coating is lightly crisp and the beef is browned. Add another tablespoon (15 ml) of oil as needed between batches, and transfer cooked pieces to a clean plate. Depending on the size of the pan, work in two or three batches; crowding makes the beef steam instead of brown. Check the thickest pieces with a food thermometer: USDA FSIS lists 145°F (63°C) with a 3-minute rest as the safe minimum for whole cuts of beef. Let each batch rest for 3 minutes before serving or returning it to the pan.
- Cook the aromatics. Once the beef is out, lower the heat to medium and add the remaining oil if the pan looks dry. Add the white parts of the scallions, ginger, garlic, and red pepper flakes if using. Stir for about 30 seconds, just until fragrant. Keep the garlic moving; browned or scorched garlic can make the sauce taste bitter.
- Thicken the sauce. Give the soy mixture another quick whisk, since cornstarch settles, then pour it into the pan. Bring it to a gentle simmer, stirring often, for about 3 minutes, until glossy and thick enough to coat the back of a spoon. If it becomes too thick, stir in water 1 tablespoon (15 ml) at a time. If it looks thin, simmer briefly longer rather than adding extra starch straight into the hot pan.
- Finish the dish. Add the rested beef and green scallion pieces, then toss for about 1 minute to coat and warm everything through. Take the pan off the heat and stir in the sesame oil, if using. Serve promptly while the beef is hot and the coating still has some crispness.
Tips
- Choose a suitable cut. Flank steak is easy to slice into long strips, but flat iron or sirloin also work. Avoid very thick pieces and slice across the visible grain. For the easiest cutting, firm the meat briefly in the freezer, but do not freeze it solid.
- Keep the pan uncrowded. A packed skillet releases moisture and lowers the heat, leaving the beef pale and soft. Use batches, let the oil heat back up between them, and add a small amount of fresh oil if the pan is dry. The starch coating should be light rather than doughy.
- Adjust the sweetness carefully. The brown sugar gives the sauce its familiar takeout-style sweetness and helps it become glossy. If you prefer a less sweet result, start with ¼ cup packed brown sugar (50 g); taste the simmering sauce and add a little more if needed. Do not reduce the soy sauce at the same time unless you also adjust the water, or the sauce may become too salty.
- Use practical swaps. Tamari can replace soy sauce in the same amount, though its flavor and salt level vary by brand; choose a gluten-free cornstarch and tamari if needed. Fresh ginger gives the clearest aroma, but ¾ teaspoon (about 1.5 g) ground ginger can stand in; it will taste warmer and less bright. Avoid substituting flour for the cornstarch coating, which will not give the same crisp finish.
Serving Suggestions
Serve Mongolian beef over steamed white or brown rice so the grains catch the extra sauce. Jasmine rice is fragrant and soft; short-grain rice is stickier and easier to eat with chopsticks. For a lighter plate, use a smaller bed of rice and add simply steamed broccoli, snap peas, bok choy, or green beans. These vegetables bring freshness and a little crunch without competing with the sweet-savory sauce.
For a fuller meal, cook vegetables separately in a hot pan and serve them alongside rather than adding them to the beef skillet. That keeps the pan hot enough to brown the meat and prevents extra vegetable moisture from thinning the sauce. A sprinkle of sesame seeds or additional sliced scallion makes a simple finish. If serving noodles instead of rice, choose plain noodles and toss them with only a little sauce at first; the beef sauce is concentrated and can overwhelm a large bowl of noodles.
Variations
Make it spicier: Increase the red pepper flakes to ½ teaspoon (about 1 g), or serve chili crisp at the table so each person can control the heat. For a milder version, leave out the flakes entirely; ginger and garlic still provide plenty of aroma.
Add vegetables: Broccoli florets, thinly sliced bell pepper, or snow peas can turn the dish into a more substantial stir-fry. Cook them separately until crisp-tender, then fold them in with the beef at the end. If you add vegetables directly to the sauce, expect a less crisp result and possibly a looser sauce because they release moisture.
Change the protein: Thinly sliced pork loin can be used, but cook it to 145°F (63°C) and rest it for 3 minutes, as with whole cuts of beef. Chicken needs a different safety target: cook it to 165°F (74°C), checked with a food thermometer. Different proteins brown at different rates, so rely on the thermometer rather than copying the beef cooking time exactly.
Make a less sugary sauce: Use ¼ cup packed brown sugar (50 g) and taste after simmering. You can add a teaspoon at a time if you want more sweetness. The sauce will be a little less syrupy, but the cornstarch still gives it a glossy coating.
Storage and Reheating
Refrigerate leftovers within 2 hours of cooking, in a shallow airtight container. They keep for 3 to 4 days in the refrigerator. The beef will soften as it sits in the sauce, so it will not retain the freshly seared texture; the flavor remains suitable for a quick next-day meal when handled and chilled promptly.
For the best reheated texture, warm a portion in a skillet over medium heat with a splash of water, stirring until hot. A microwave also works: cover loosely, heat in short intervals, and stir between them so the sauce warms evenly. Reheat leftovers to 165°F (74°C), checked with a food thermometer. Avoid repeatedly cooling and reheating the whole batch; warm only what you plan to eat. Freeze portions in airtight containers for up to 2 months for best quality, then thaw overnight in the refrigerator and reheat to 165°F (74°C).
Frequently Asked Questions
What does Mongolian beef taste like?
The sauce is sweet and savory, with saltiness from soy sauce and a rounded molasses note from brown sugar. Garlic and ginger add a fragrant, lightly warm flavor, while red pepper flakes can bring gentle heat. The beef itself should taste browned and meaty rather than heavily battered. This recipe is moderately sweet; you can reduce the sugar as described if you prefer a more savory balance.
Is Mongolian beef actually from Mongolia?
This familiar version is an American Chinese restaurant-style dish, not a traditional Mongolian recipe. The name does not mean that the ingredients or cooking method represent a single Mongolian regional tradition. Restaurant and home recipes differ, especially in how sweet the sauce is, whether the beef is crisped, and which vegetables are included.
How do I keep the beef tender?
Cut thinly across the grain, dry the surface before coating, and sear in batches in a properly hot pan. Overcrowding traps steam, and leaving thin strips in the pan too long can make them chewy. Use a thermometer to meet the safe temperature, then observe the 3-minute rest for whole cuts; thin strips cook quickly, so check a representative thick piece rather than relying only on a timer.
Can I make the sauce ahead?
Yes. Whisk the soy sauce, water, brown sugar, and cornstarch together and refrigerate the mixture in a covered container for up to 1 day. Stir or whisk it thoroughly just before pouring, because the cornstarch settles. For the best texture, slice and coat the beef shortly before cooking instead of leaving it sitting in the starch for hours.
Why is my sauce too thin or too thick?
A thin sauce may need another minute or two of gentle simmering, since cornstarch thickens as the mixture heats. If it is too thick, stir in water a tablespoon (15 ml) at a time until it flows easily around the beef. Always whisk the sauce mixture before it goes into the skillet; settled cornstarch can otherwise leave the sauce uneven.
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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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