1. Slice your flank steak against the grain into thin strips about 1/4-inch thick. Look at the muscle fibers and cut perpendicular to them—this is THE most important step for tender beef.
2. In a bowl, whisk together the soy sauce, oyster sauce, cornstarch, sugar, and black pepper until smooth. Add the sliced beef, toss well to coat every piece, and let it marinate at room temperature for 30 minutes (or up to 2 hours in the fridge).
3. Heat your wok or large skillet over the highest heat your stove has until it’s smoking hot—seriously, you want it almost scary hot. This high heat is key to proper stir-frying.
4. Add 1 tablespoon of vegetable oil and swirl to coat the pan. Add half the marinated beef in a single layer and let it sear undisturbed for about 1 minute—resist the urge to stir. Then toss and cook for another 1-2 minutes until browned but still slightly pink inside. Remove to a plate and repeat with remaining beef if needed to avoid overcrowding.
5. Add the remaining tablespoon of oil to the wok. Toss in the onion and bell pepper strips, stir-frying for about 2-3 minutes until they’re slightly softened but still crisp—you want some crunch remaining.
6. Add the minced garlic and stir-fry for just 30 seconds until fragrant. Don’t let it burn or it’ll taste bitter.
7. Return all the cooked beef to the wok, pour in the beef broth and sesame oil, and toss everything together vigorously. Cook for another 2-3 minutes, stirring constantly, until the sauce thickens and coats everything beautifully. The cornstarch from the marinade will naturally thicken the sauce.
8. Serve immediately over steamed white rice while everything’s piping hot. The sauce will soak into the rice perfectly.

Nutrition Information (Per Serving):

• Calories: 320
• Carbohydrates: 12g
• Protein: 28g
• Fat: 18g
• Fiber: 2g
• Sodium: 980mg
• Iron: 20% DV
• Vitamin C: 70% DV

High in protein and iron, plus bell peppers provide excellent vitamin C. Relatively balanced when served with rice and vegetables.

Notes:

• Seriously, slice against the grain—this makes or breaks the tenderness of your beef.
• Your wok or pan MUST be smoking hot before you add ingredients—medium heat doesn’t work for stir-fries.
• Don’t overcrowd the pan—cook beef in batches if needed or it’ll steam instead of sear.
• Add sesame oil at the end, never for cooking, to preserve its flavor and aroma.
• The vegetables should still have some crunch when done—nobody wants mushy peppers.

Storage Tips:

Store leftovers in an airtight container in the fridge for up to 3 days. Reheat in a hot skillet or wok over high heat, stirring constantly—microwaving makes the beef tough and the vegetables mushy. Add a splash of beef broth if it seems dry. The texture won’t be quite as good as fresh, but it’s still tasty. Don’t freeze pepper steak—the vegetables get watery and weird when thawed.

Serving Suggestions:

• Classic Style: Serve over steamed jasmine or white rice with the sauce spooned over everything
• Complete Meal: Pair with egg drop soup and spring rolls for a full Chinese-American dinner
• Low-Carb: Serve over cauliflower rice or zucchini noodles instead of white rice
• Noodle Bowl: Toss with lo mein noodles instead of serving over rice for variety

Mix It Up (Recipe Variations):

Spicy Pepper Steak: Add 1-2 tsp chili garlic sauce or sriracha to the marinade for heat lovers.

Rainbow Pepper Steak: Use red, yellow, and orange bell peppers for gorgeous color and slightly different sweet flavors.

Ginger Pepper Steak: Add 1 tbsp fresh grated ginger with the garlic for bright, zingy flavor that’s absolutely addictive.

Mushroom Pepper Steak: Add 1 cup sliced shiitake or button mushrooms with the vegetables for extra umami depth.

Black Pepper Beef: Increase black pepper to 1 tbsp and add 1 tsp Sichuan peppercorns for bold, numbing heat.

What Makes This Recipe Special:

Pepper steak showcases Chinese-American restaurant cooking at its best—quick, high-heat stir-frying that preserves texture while building complex flavors through proper marinating and sauce technique. The velveting process with cornstarch creates that signature tender, glossy texture that distinguishes restaurant-quality stir-fries from home-cooked versions.