1/3 c. soy sauce
2 tbsp. white vinegar
2 tbsp. Worcestershire sauce
Dash garlic powder
Sirloin tip or London broil

Mix together first 4 ingredients. Place your cut of meat in a plastic Ziploc bag and pour the marinade over it. Let set for 2 hours or overnight. Cook on grill until tender. Baste with marinade sauce.