Preheat grill.
Thread beef, onion, bell pepper, pineapple and tomatoes alternately on skewers.
In a small bowl combine reserved pineapple juice, honey, brown sugar, garlic powder, Worcestershire sauce and pepper. Stir until sugar is dissolved; set aside.
Grill kabobs for 18 to 22 minutes, turning often, while brushing on marinade every 3 to 4 minutes.
Servings: 4