Recipe for Beef Stir Fry With Peppers and Onions: Wok-Seared Tender Beef With Vibrant Veggies

This stir-fry delivers tender beef and crisp vegetables with every bite. The key is high heat and quick cooking to lock in flavor and texture.

I developed this method after years of trial and error, focusing on the perfect balance between meat and veggies. Thinly sliced beef cooks in minutes, while peppers and onions retain their vibrant crunch.

The sauce ties everything together with a savory-sweet finish that coats each ingredient. Serve over steamed rice for a complete, restaurant-quality meal at home.

This dish proves that weeknight dinners can be both quick and impressive. Ready in under 30 minutes, it’s a go-to for busy evenings.

Ingredients for Recipe for Beef Stir Fry with Peppers and Onions

Thinly sliced beef, vibrant peppers, and onions come together for a restaurant-quality stir-fry at home.

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Flank steak is ideal for stir-fry—well-marbled cuts from Whole Foods or Costco yield the most tender results. Slice against the grain for maximum tenderness (this is non-negotiable for that melt-in-your-mouth texture). The peppers should be firm and glossy; avoid any with soft spots. For the onions, yellow or white varieties offer the best balance of sweetness and bite. Always prep all ingredients before heating the wok—things move fast once cooking begins.

No flank steak? Skirt steak or sirloin work well too (just trim excess fat). Vegetarian? Swap beef for extra-firm tofu pressed and cubed. Out of oyster sauce? Hoisin sauce at half the amount adds similar depth. Rice vinegar can be replaced with apple cider vinegar in a pinch. For gluten-free, use tamari instead of soy sauce (check labels at Trader Joe’s for quality options).

Store sliced beef in the fridge for up to 1 day before cooking. The sauce components keep for 1 week refrigerated. Leftovers? They’re great for 3 days in the fridge—reheat in a skillet to maintain texture. Freezing isn’t recommended as it softens the vegetables.

Step-by-Step Instructions for Beef Stir Fry With Peppers and Onions

Master the wok with this precise method for tender beef and crisp vegetables every time.

Step 1: Velouté the Beef With Cornstarch

Slice the 1.25 lb Flank Steak thinly against the grain into ¼-inch strips. This shortens the muscle fibers for maximum tenderness. Toss the strips with 1 tbsp Cornstarch until evenly coated—the cornstarch creates a protective barrier that locks in juices during high-heat cooking.

Let the beef sit for 10 minutes while you prep the remaining ingredients. The cornstarch will absorb surface moisture, forming a light crust that prevents the beef from steaming in the wok. This step is non-negotiable for achieving that restaurant-quality velvety texture.

Step 2: Stir-Fry Aromatics and Vegetables

Heat 1 tbsp Vegetable Oil in a wok or large skillet over high heat until shimmering. Add the sliced 2 whole Red Bell Pepper, 2 whole Green Bell Pepper, and 1 whole Yellow Onion. Stir-fry for 3-4 minutes until the vegetables are crisp-tender and the edges begin to char.

Push the vegetables to one side of the wok and add the remaining 2 tbsp Vegetable Oil. Immediately add the 4 cloves Garlic Cloves and 1 tbsp Fresh Ginger, stir-frying for 30 seconds until fragrant. Be careful not to burn the aromatics—burnt garlic turns bitter and ruins the dish.

Step 3: Cook the Beef to Perfection

Add the cornstarch-coated beef to the wok in a single layer, using a spatula to spread it out. Let it sear undisturbed for 30 seconds before stirring. This initial sear creates a beautiful brown crust. Cook for 2-3 minutes total until the beef is browned on all sides but still slightly pink inside.

The beef will release its juices as it cooks—keep the heat high and stir constantly to prevent steaming. You’re aiming for a quick sear, not a slow simmer. The beef should be tender with a slight bounce when done, not tough or chewy.

Step 4: Create the Signature Sauce

Combine ⅓ cup Soy Sauce, 2 tbsp Oyster Sauce, 1 tbsp Rice Vinegar, and 1 tbsp Brown Sugar in a small bowl. Pour this mixture over the beef and vegetables in the wok. Stir well to coat everything evenly.

Let the sauce simmer for 1-2 minutes until it thickens slightly and coats the back of a spoon. The cornstarch from the beef will help thicken the sauce to a glossy, velvety consistency. Taste and adjust seasoning if needed, though the combination of soy and oyster sauce should provide perfect balance.

Step 5: Finish and Garnish

Remove the wok from heat and stir in 1 tbsp Sesame Oil. This final addition adds a nutty aroma that ties all the flavors together. The sesame oil should be added off heat to preserve its delicate flavor.

Transfer to a serving platter and garnish with 4 whole Green Onions and 1 tsp Sesame Seeds. The green onions add a fresh, oniony bite while the sesame seeds provide a subtle crunch and visual appeal. Serve immediately over steamed rice to soak up the delicious sauce.

Health Benefits of These Flavors

Protein Powerhouse

This dish packs a serious protein punch with 1.25 lb flank steak providing about 50g of protein per serving. Protein is essential for muscle repair and growth, keeping you full and energized throughout the day. I love that this meal fuels my busy days with Tom and Lily. 💪

Vitamin C Boost

The colorful peppers in this stir-fry are loaded with vitamin C—just 1 cup of bell peppers provides over 100% of your daily needs. This antioxidant supports immune function and helps your body absorb iron from the beef.

Rich in Iron

Beef is one of the best sources of heme iron, the type your body absorbs most easily. A serving of this dish delivers about 15% of your daily iron, helping prevent fatigue and keeping your energy levels steady. Pair with the peppers’ vitamin C for maximum absorption.

Low-Calorie, High-Nutrient

Despite its rich flavors, this stir-fry is surprisingly light. Each serving contains roughly 350-400 calories while delivering a balanced mix of protein, fiber, and essential vitamins. It’s a meal that satisfies without weighing you down. ✨

Digestive Benefits

The onions and garlic in this recipe contain prebiotic fiber that supports gut health. These compounds feed the good bacteria in your digestive system, promoting better digestion and overall wellness. Even Pickles seems to beg for a bite when I make this!

Heart-Healthy Fats

The vegetable oil and sesame oil used in cooking provide unsaturated fats, which support heart health. These healthy fats help lower bad cholesterol levels while maintaining the dish’s delicious flavor profile.

Frequently Asked Questions