Mongolian Beef With Broccoli – A Savory, Weeknight Stir-Fry
Mongolian Beef with Broccoli is the kind of dish that wins over everyone at the table. It’s fast, bold, and full of that sweet-salty, garlicky punch you crave from a good stir-fry. Think tender slices of beef, crisp-tender broccoli, and a glossy sauce that clings to every bite.
You don’t need a wok or special skills—just a hot pan and a few simple tricks. This is an easy, satisfying meal you can whip up on a weeknight and still be proud to serve guests.
Mongolian Beef With Broccoli - A Savory, Weeknight Stir-Fry
Ingredients
Method
- Prep the beef: Freeze the steak for 20–30 minutes to firm it up.Slice thinly against the grain. Toss with 3 tablespoons cornstarch until lightly coated. Set aside while you prep the rest.
- Make the sauce: In a bowl, whisk soy sauce, water/broth, brown sugar, 1 tablespoon cornstarch, rice vinegar, and chili-garlic sauce if using.Keep it nearby.
- Par-cook the broccoli: Blanch florets in boiling salted water for 1 minute, then drain and shock in cold water. Pat dry. Alternatively, stir-fry the broccoli in a teaspoon of oil for 2–3 minutes until bright green and crisp-tender.Remove and set aside.
- Heat the pan: Use a large skillet or wok. Add 1 tablespoon oil over medium-high to high heat until shimmering. Work in batches for the beef—crowding will steam it.
- Sear the beef: Add a single layer of beef and let it sear undisturbed for 45–60 seconds, then stir-fry another minute until mostly browned but not fully cooked.Remove to a plate. Repeat with remaining oil and beef.
- Sauté aromatics: Lower heat slightly. Add garlic, ginger, and the white parts of the green onions.Stir for 20–30 seconds until fragrant—do not burn.
- Build the sauce: Give the sauce a quick stir, then pour it into the pan. Let it bubble for 30–60 seconds until it starts to thicken and turn glossy.
- Combine: Return beef and broccoli to the pan. Toss to coat.Stir-fry 1–2 minutes until the beef is just cooked through and the broccoli is heated. If using, finish with sesame oil.
- Garnish and serve: Remove from heat. Top with green onion tops and sesame seeds.Serve over warm rice or noodles. Squeeze a bit of lime if you like brightness.
Why This Recipe Works
This version balances sweetness and savoriness without being cloying. A touch of brown sugar helps the sauce caramelize, while soy sauce, garlic, and ginger keep it grounded.
Cornstarch lightly coats the beef, creating a crisp edge that holds up in the sauce. Blanching or quick-searing broccoli keeps it bright and tender, not soggy. The sauce reduces fast in a hot pan, giving you that restaurant-style sheen and flavor in under 30 minutes.
Ingredients
- 1 lb (450 g) flank steak, thinly sliced against the grain
- 3 cups broccoli florets, bite-size
- 3 tablespoons cornstarch (for beef)
- 2 tablespoons neutral oil (canola, vegetable, or avocado), plus more as needed
- 4 cloves garlic, minced
- 1 tablespoon fresh ginger, minced or grated
- 3 green onions, sliced (whites and greens separated)
- Sesame seeds, for garnish (optional)
Sauce:
- 1/2 cup low-sodium soy sauce
- 1/3 cup water or low-sodium beef broth
- 1/4 cup brown sugar (light or dark)
- 1 tablespoon cornstarch
- 1 tablespoon rice vinegar (or apple cider vinegar)
- 1–2 teaspoons chili-garlic sauce or red pepper flakes (optional, for heat)
- 1 teaspoon toasted sesame oil (optional, for finish)
To serve:
- Steamed jasmine rice or noodles
- Lime wedges (optional)
How to Make It
- Prep the beef: Freeze the steak for 20–30 minutes to firm it up.Slice thinly against the grain. Toss with 3 tablespoons cornstarch until lightly coated. Set aside while you prep the rest.
- Make the sauce: In a bowl, whisk soy sauce, water/broth, brown sugar, 1 tablespoon cornstarch, rice vinegar, and chili-garlic sauce if using.Keep it nearby.
- Par-cook the broccoli: Blanch florets in boiling salted water for 1 minute, then drain and shock in cold water. Pat dry. Alternatively, stir-fry the broccoli in a teaspoon of oil for 2–3 minutes until bright green and crisp-tender.Remove and set aside.
- Heat the pan: Use a large skillet or wok. Add 1 tablespoon oil over medium-high to high heat until shimmering. Work in batches for the beef—crowding will steam it.
- Sear the beef: Add a single layer of beef and let it sear undisturbed for 45–60 seconds, then stir-fry another minute until mostly browned but not fully cooked.Remove to a plate. Repeat with remaining oil and beef.
- Sauté aromatics: Lower heat slightly. Add garlic, ginger, and the white parts of the green onions.Stir for 20–30 seconds until fragrant—do not burn.
- Build the sauce: Give the sauce a quick stir, then pour it into the pan. Let it bubble for 30–60 seconds until it starts to thicken and turn glossy.
- Combine: Return beef and broccoli to the pan. Toss to coat.Stir-fry 1–2 minutes until the beef is just cooked through and the broccoli is heated. If using, finish with sesame oil.
- Garnish and serve: Remove from heat. Top with green onion tops and sesame seeds.Serve over warm rice or noodles. Squeeze a bit of lime if you like brightness.
Storage Instructions
- Refrigeration: Store in an airtight container for up to 4 days. Cool before sealing to avoid condensation.
- Reheating: Reheat gently on the stovetop over medium heat with a splash of water to loosen the sauce.Microwave in 30-second bursts, stirring between.
- Freezing: Freeze for up to 2 months. Thaw overnight in the fridge, then reheat on the stove. The broccoli may soften slightly but will still taste great.
- Make-ahead tips: Slice beef and mix sauce up to 24 hours ahead.Keep them separate in the fridge. Cook fresh for best texture.
Health Benefits
- Lean protein: Flank steak provides iron, zinc, and B vitamins that support energy and muscle health.
- Fiber and vitamins: Broccoli brings fiber, vitamin C, vitamin K, and folate. It’s also rich in antioxidants.
- Controlled sodium and sugar: Using low-sodium soy sauce and measuring the brown sugar keeps the sauce balanced without going overboard.
- Healthy swaps: Avocado or canola oil handles high heat with less saturated fat.You can also reduce sugar by a tablespoon and increase aromatics for flavor.
Pitfalls to Watch Out For
- Overcrowding the pan: Too much beef at once steams instead of sears. Cook in batches for a better crust.
- Cutting with the grain: Slicing along the grain makes the beef chewy. Always slice against the grain into thin strips.
- Burning garlic and ginger: They cook fast.Add them after searing the beef, and stir constantly for under a minute.
- Watery sauce: If the sauce doesn’t thicken, it likely needs more heat or the cornstarch wasn’t mixed well. Simmer another minute and stir.
- Mushy broccoli: Overcooking dulls color and texture. Blanch briefly or quick-stir-fry until just tender.
Alternatives
- Different cuts of beef: Sirloin, flat iron, or skirt steak work well.If using chuck, slice very thin and tenderize longer.
- Other proteins: Try chicken thighs, pork tenderloin, or extra-firm tofu (press and cornstarch-coat for crisp edges).
- Veggie swaps: Snap peas, bell peppers, mushrooms, or baby bok choy are excellent. Mix and match for color and crunch.
- Gluten-free: Use tamari or certified gluten-free soy sauce. Check labels on chili-garlic sauce too.
- Lower sugar: Cut brown sugar to 2 tablespoons and add 1 extra teaspoon rice vinegar for balance.
- No cornstarch: Use arrowroot or potato starch in the same amount.Add it to cold liquid to avoid clumps.
- Extra heat: Add more chili-garlic sauce, a sliced fresh chili, or a dash of Szechuan peppercorn for a tingling finish.
FAQ
Can I make this without a wok?
Yes. A large stainless steel or cast-iron skillet works great. Preheat it well and avoid overcrowding to get that seared edge on the beef.
How do I slice beef thinly without a deli slicer?
Partially freeze the steak for 20–30 minutes.
Use a sharp knife and slice against the grain into 1/8-inch strips. Keep your non-cutting hand flat and stable for safety.
What if my sauce is too salty?
Add a splash of water or unsalted broth and a pinch more brown sugar to balance. Next time, use low-sodium soy sauce and avoid reducing the sauce too long.
Can I make it spicy?
Absolutely.
Add chili-garlic sauce to the base, toss in red pepper flakes, or finish with fresh sliced chilies. Start small and adjust to taste.
What’s the best way to reheat leftovers without drying the beef?
Reheat gently on the stovetop with a tablespoon of water to loosen the sauce. Stir just until hot.
Avoid high heat or long microwaving, which can toughen the beef.
Is flank steak required?
No. Sirloin or flat iron are great alternatives. Prioritize slicing thin against the grain and not overcooking—those two steps keep most cuts tender.
Can I add noodles instead of rice?
Yes.
Cook lo mein or rice noodles according to package directions. Toss them directly into the pan with the sauce, beef, and broccoli to coat.
Wrapping Up
Mongolian Beef with Broccoli brings big flavor with simple steps and weeknight timing. With a hot pan, thin-sliced beef, and a balanced sauce, you’ll get tender meat, crisp veggies, and that glossy finish you love.
Customize the heat, swap in your favorite vegetables, and pair it with rice or noodles. It’s reliable, tasty, and easy to repeat. Keep this one in your rotation for a fast, crowd-pleasing dinner.
