Stir-Fried Lemongrass Beef with Bell Peppers and Onions

By AislePrompt Editorial · Published 2026-05-18 · Updated 2026-05-18

Tender strips of beef quickly stir-fried with fragrant lemongrass, colorful bell peppers, and onions in a savory-sweet sauce. This Vietnamese-inspired beef recipe, ready in about 30 minutes, pairs lemongrass stalk, finely minced, garlic cloves, minced, red bell pepper, sliced into strips for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 380 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1 lb flank steak, thinly sliced against the grain
• 1 lemongrass stalk, finely minced
• 3 garlic cloves, minced
• 1 medium red bell pepper, sliced into strips
• 1 medium yellow bell pepper, sliced into strips
• 1 large onion, sliced
• 3 tbsp soy sauce
• 1 tbsp fish sauce
• 1 tbsp brown sugar
• 3 tbsp vegetable oil
• 1/2 tsp black pepper
• 2 tbsp chopped scallions
• for serving cooked jasmine rice

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Instructions

1. Step 1: In a bowl, toss 1 lb thinly sliced flank steak with 1 finely minced lemongrass stalk, 3 minced garlic cloves, 3 tbsp soy sauce, 1 tbsp fish sauce, 1 tbsp brown sugar, and 1/2 tsp black pepper. Marinate for 15 minutes.
2. Step 2: Heat 3 tbsp vegetable oil in a large wok or skillet over high heat until shimmering. Add the marinated beef and stir-fry for 2-3 minutes until just browned but not fully cooked.
3. Step 3: Add 1 sliced large onion, 1 sliced red bell pepper, and 1 sliced yellow bell pepper. Stir-fry together for 3-4 minutes until the vegetables are tender-crisp and the beef is cooked through.
4. Step 4: Remove from heat and sprinkle with 2 tbsp chopped scallions. Toss gently to combine.
5. Step 5: Serve immediately over hot steamed jasmine rice for a quick, flavorful weeknight dinner.