Name: Beef Onion Stir Fry Recipe
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Asian
Ingredients: 1 lb beef sirloin, sliced against the grain; 2 medium yellow onions, thinly sliced; 1 cup bell peppers (red, yellow, or green), sliced; 3 cloves garlic, minced; 3 tbsp low-sodium soy sauce; 1 tbsp brown sugar; 1 tsp cornstarch mixed with 2 tbsp water; 1 tbsp sesame oil; 2 tbsp vegetable oil

Description

This Beef Onion Stir Fry is a quick and flavorful dish featuring tender sirloin slices marinated in a savory soy sauce mixture, stir-fried with sweet onions and colorful bell peppers. Perfect for a weeknight meal, it combines simple ingredients with a sweet-savory balance and can be served over steamed rice or noodles for a satisfying dinner.

Ingredients

Scale

Meat

1 lb beef sirloin, sliced against the grain

Vegetables

2 medium yellow onions, thinly sliced
1 cup bell peppers (red, yellow, or green), sliced
3 cloves garlic, minced

Marinade & Sauce

3 tbsp low-sodium soy sauce
1 tbsp brown sugar
1 tsp cornstarch mixed with 2 tbsp water
1 tbsp sesame oil

Cooking Oil

2 tbsp vegetable oil

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Instructions

Marinate the Beef: In a bowl, combine the beef sirloin slices with soy sauce, the cornstarch mixture, and brown sugar. Toss to coat evenly and let it marinate for at least 15 minutes to allow the flavors to infuse and help tenderize the meat.
Sauté Aromatics and Onions: Heat vegetable oil in a large skillet over medium-high heat. Add the minced garlic and sliced onions, sautéing until the onions become translucent and fragrant, about 3-4 minutes.
Add Bell Peppers: Introduce the sliced bell peppers to the skillet and stir-fry for 2 to 3 minutes until they start to soften but still retain some crunch.
Cook the Beef: Push the vegetables to the side of the skillet, clearing space for the beef. Add the marinated beef to the empty side and cook until browned on all sides, about 4 to 5 minutes. Stir occasionally to ensure even cooking.
Combine and Thicken Sauce: Return the vegetables to the center of the skillet with the beef. Pour in any remaining marinade from the bowl. Stir everything together and cook for another 2 to 3 minutes until the sauce thickens and coats all the ingredients.
Serve: Remove from heat and serve the stir fry hot over steamed rice or noodles for a complete meal.

Notes

For a spicier dish, add sliced chili peppers or a dash of chili flakes during cooking.
To make this recipe gluten-free, use tamari or gluten-free soy sauce.
Slice the beef thinly against the grain for maximum tenderness.
Vegetables can be varied—try adding snap peas or broccoli for extra texture and nutrition.
Sesame oil adds a nutty aroma; do not substitute it entirely with vegetable oil.