In a bowl, combine red wine, sherry, soy sauce, sesame oil, grated ginger root, pineapple juice, thyme, rosemary, worcestershire sauce, chopped onion, pepper. Pour over cubed sirloin steak. Marinate for 2 hours at room temperature.
Alternate the beef on skewers with prepared tomatoes, mushrooms, eggplant, green bell pepper, and yellow squash.
Grill 3-inches from the heat for about 15 minutes, turning frequently and basting with the marinade. (Discard any unused marinade.)
Servings: 6