Place the flank steak on a cutting board and cover it with plastic. Use a meat mallet to pound it to ½-inch thick. Thinly slice the steak as thinly as you can— about ⅛ inch. Season the steak lightly with salt and pepper.
1 lb. flank steak
Heat a large skillet over medium high heat. Add 1 tablespoon of olive oil. Add as much steak as will fit to the pan—you don’t want to overcrowd it!
2 tbsp olive oil
Cook the steak for 1-2 minutes per side, or until cooked to your desired doneness. Remove the steak to a plate and continue searing the steak in batches until it has all been cooked.
Add the remaining tablespoon of olive oil to the pan. When it is warm, add the onion. Sauté for 2-3 minutes, or until just beginning to soften.
1 sweet onion
Add the red and green bell peppers. Cook for an additional 3-4 minutes, or until the peppers are tender.
1 green bell pepper, 1 red bell pepper
Add the seared steak and sauce to the pan. Cook for 1-2 minutes or until the sauce has thickened and the steak is warmed through again.
Serve over rice garnished with sesame seeds and sliced green onion.
3 cups cooked white rice, sesame seeds and sliced green onion