Cut up steak into cubes. Thread onto a skewer (wood or metal) alternating with red onion and green, yellow, and red peppers.  Optional ingredients are mushrooms or cherry tomatoes.  Sprinkle with salt and pepper, or soy/teriyaki sauce to taste.

Cook over high heat for about 2 minutes per side, so about 8-10 minutes total.  Remove from grill, cover with foil, and allow to rest for five minutes.  Serve over a bed of couscous for a one-dish meal.