In a shallow glass dish, combine soy sauce, honey, ginger, garlic, lemon peel and red pepper flakes. Mix well. Add beef ; stir to coat. Cover with plastic wrap and refridgerate for 1 to 2 hours, stirring occasionally.

Preheat broiler. Remove beef from the marinade. Discard marinade. Using 4 10-inch metal skewers, alternately thread beef, tomatoes and bell peppers. Place on a broiler pan.

Broil 2 inches from heat, turning 2 or 3 times, until meat is medium-rare and vegetables are tender. Place on serving plates and serve immediately.