Sirloin Kabobs are one of the "fun" barbecue meals. Place beef in bowl. Mix your favorite marinade; pour over beef, cover and refrigerate, stirring occasionally, at least one hour. Thread beef cubes and vegetables on skewers; brush with marinade. Either broil in a grill or an oven. In an oven broil kabobs with tops about eight inches from heat; turn and brush with marinade. Broil until done no more than medium rare. Brush with marinade again before serving. On a grill use the same approach as with a Sirloin Steak brushing now and then with your marinade.