If you’re searching for a quick, satisfying meal that packs a punch of flavor, look no further than this Pepper Steak Stir-Fry. This dish is not only vibrant and colorful but also brings together tender slices of flank steak with a medley of fresh peppers, all tossed in a savory sauce that will have your taste buds dancing. Perfect for busy weeknights, this recipe is straightforward yet delivers a gourmet experience right in your kitchen.
What Makes This Recipe Special

What sets this Pepper Steak Stir-Fry apart is the balance of flavors and textures. The flank steak is marinated in a delicious mixture of soy sauce, rice vinegar, and sesame oil, which infuses the meat with a rich umami taste. The combination of red, yellow, and jalapeño peppers not only adds a beautiful rainbow of colors but also a delightful crunch. The use of cornstarch creates a velvety sauce that clings to the beef and vegetables beautifully, making every bite a burst of flavor.
Ingredient Notes
- 1/3 cup light soy sauce: This gives the dish its savory base. Opt for low-sodium if you prefer.
- 1/3 cup rice vinegar: Adds a tangy depth that balances the richness of the meat.
- 1 tablespoon sesame oil: Provides a nutty aroma and flavor that complements the beef.
- 1 teaspoon black pepper: Enhances the overall flavor with a bit of heat.
- 1 tablespoon cornstarch: Used to thicken the sauce, ensuring it coats the beef and veggies perfectly.
- 1 pound flank steak, sliced: Tender and ideal for stir-frying; slice against the grain for the best texture.
- 1 tablespoon olive oil: For sautéing the vegetables and beef.
- 1 onion, chopped: Adds sweetness and depth to the stir-fry.
- 3 garlic cloves, minced: For an aromatic kick.
- 1 red bell pepper, chopped: Brings sweetness and color.
- 1 yellow bell pepper, chopped: Adds brightness and additional crunch.
- 1 jalapeño pepper, deveined and deseeded, minced: For a spicy finish; adjust according to your heat preference.
Essential Tools for Success
- Wok or large skillet: Essential for high-heat cooking to achieve the perfect stir-fry.
- Chef’s knife: For slicing the flank steak and chopping vegetables with precision.
- Cutting board: A sturdy surface for all your chopping needs.
- Spatula or wooden spoon: Ideal for tossing the meat and vegetables evenly.
Method: Pepper Steak Stir-Fry

Step 1: Prepare the Marinade
In a bowl, whisk together the light soy sauce, rice vinegar, sesame oil, black pepper, and cornstarch until well combined. Add the sliced flank steak to the marinade and let it sit for at least 15 minutes. This step is crucial for infusing the meat with flavor and ensuring tenderness.
Step 2: Heat the Pan
In a large wok or skillet, heat the olive oil over medium-high heat. Make sure the oil is hot before adding the meat to get that beautiful sear.
Step 3: Cook the Flank Steak
Add the marinated flank steak to the pan in a single layer. Sear for about 2-3 minutes without stirring to develop a nice crust. Once browned, stir-fry for an additional 2 minutes until cooked through. Remove the steak from the pan and set aside.
Step 4: Sauté the Vegetables
In the same pan, add the chopped onion and minced garlic. Sauté for 1-2 minutes until fragrant. Then add the chopped red and yellow bell peppers along with the minced jalapeño. Stir-fry for about 4-5 minutes until the vegetables are tender but still crisp.
Step 5: Combine and Serve
Return the cooked flank steak to the pan with the vegetables. Pour in any remaining marinade and stir to combine. Cook for an additional minute until everything is heated through and the sauce has thickened slightly. Serve hot over steamed rice or noodles.
Make It Fit Your Plan

- Low-Carb Option: Serve over cauliflower rice instead of traditional rice.
- Vegetarian Version: Substitute flank steak with tofu or tempeh for a plant-based option.
- Extra Veggies: Feel free to add additional vegetables like broccoli, snap peas, or carrots.
- Gluten-Free: Use tamari instead of soy sauce to keep the dish gluten-free.
Problems & Prevention
Stir-frying can be tricky if you’re not careful. Here are some common problems and how to prevent them:
- Overcrowding the Pan: This leads to steaming instead of frying. Cook in batches if necessary.
- Meat Not Browning: Ensure the oil is hot enough before adding the meat, and avoid stirring too soon.
- Vegetables Becoming Soggy: Don’t overcook the vegetables; they should remain vibrant and crisp.
Make-Ahead & Storage
This Pepper Steak Stir-Fry is best enjoyed fresh, but you can make it ahead if needed. Store any leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, simply pop it in the microwave or warm it in a skillet over medium heat until heated through.
Quick Q&A
Can I use a different cut of beef?
Absolutely! Cuts like sirloin or ribeye can work well, but flank steak is preferred for its tenderness and flavor when sliced correctly.
Is it possible to freeze this stir-fry?
While it’s best fresh, you can freeze the cooked stir-fry. Just be aware that the texture of the vegetables may change upon reheating.
How can I adjust the spice level?
If you prefer less heat, omit the jalapeño or reduce the amount. Conversely, add more if you like a spicier dish.
What can I serve with Pepper Steak Stir-Fry?
This stir-fry pairs wonderfully with steamed rice, noodles, or even a fresh green salad for a lighter option.
Bring It to the Table
Now that you have all the tips and tricks to make a delicious Pepper Steak Stir-Fry, it’s time to gather your loved ones and enjoy this vibrant dish together. Whether it’s a casual weeknight dinner or a gathering with friends, this stir-fry is sure to impress. The beautiful colors, tantalizing aroma, and hearty flavors will have everyone coming back for seconds. Enjoy your cooking adventure and the delicious results that follow!

Pepper Steak Stir-Fry
Ingredients
Equipment
Method
- Step 1: Prepare the Marinade - In a bowl, whisk together the light soy sauce, rice vinegar, sesame oil, black pepper, and cornstarch until well combined. Add the sliced flank steak to the marinade and let it sit for at least 15 minutes.
- Step 2: Heat the Pan - In a large wok or skillet, heat the olive oil over medium-high heat until hot.
- Step 3: Cook the Flank Steak - Add the marinated flank steak in a single layer, sear for about 2-3 minutes, then stir-fry for an additional 2 minutes until cooked through. Remove and set aside.
- Step 4: Sauté the Vegetables - In the same pan, add the chopped onion and minced garlic, sauté for 1-2 minutes, then add the chopped red and yellow bell peppers and minced jalapeño. Stir-fry for about 4-5 minutes.
- Step 5: Combine and Serve - Return the steak to the pan, pour in the remaining marinade, and stir to combine. Cook for an additional minute and serve hot over steamed rice or noodles.
Notes
- For a low-carb option, serve over cauliflower rice instead of rice.
- Substitute flank steak with tofu or tempeh for a vegetarian version.
- Add extra veggies like broccoli or snap peas for more nutrition.
