Step 1: Prepare the Steak

Cut the flank steak into thin strips, making sure to cut against the grain. This will ensure a tender texture.

Step 2: Marinate the Steak

In a bowl, combine the steak strips with soy sauce, cornstarch, and a dash of black pepper. Let this marinate for 15-30 minutes for maximum flavor.

Step 3: Slice the Vegetables

While the steak is marinating, slice the onions and bell peppers into thin strips. This will allow them to cook evenly and quickly.

Step 4: Heat the Pan

In a large skillet or wok, heat a tablespoon of oil over medium-high heat until it shimmers.

Step 5: Cook the Steak

Add the marinated steak to the pan in a single layer. Cook for about 2-3 minutes until it begins to brown, then remove it from the pan and set aside.

Step 6: Sauté the Vegetables

In the same pan, add another tablespoon of oil if necessary. Add the sliced onions and bell peppers, cooking until they are tender but still crisp, about 4-5 minutes.

Step 7: Combine Steak and Vegetables

Return the steak to the skillet with the veggies. Stir everything together and cook for an additional 2-3 minutes until heated through.

Step 8: Add Sauce

In a small bowl, mix in soy sauce, water, and pepper. Pour this sauce over the steak and vegetables, stirring to coat everything evenly. Let it simmer for a minute.

Step 9: Serve and Enjoy

Remove from heat and serve the sizzling steak pepper combination over rice or noodles. Garnish as desired.