In a flat baking dish stir together the ketchup, soy sauce, Worcestershire sauce, brown sugar, garlic, chili powder, salt and pepper. Add the steak and turn to coat. Cover and marinate in the refrigerator for 2 to 8 hours. Remove the steak from the marinade. Place the steak tightly in the Flat Standard basket, rotating for 18 minutes for rare or 25 minutes for medium. If not brown enough, position the basket facing the Heating Element and turn the Pause-to-Sear switch to off. Rotate 2 to 3 minutes more on each side. Remove and slice thinly across the grain into thin strips. Serves 4.