Ingredients

1/4 cup wine vinegar
1/2 cup vegetable oil
1/4 cup ketchup
1 teaspoon salt
1/2 teaspoon oregano
1/4 teaspoon black pepper
2 tablespoons Worcestershire sauce
1/2 cup chopped onion
2 cloves minced garlic
3 lbs sirloin steak, cut into 1 inch cubes
green pepper, cut into squares
red pepper, cut into squares
yellow pepper, cut into squares
1 small onion
cherry tomato
mushroom

Directions

Mix together first nine ingredients for marinade.Add meat, stir to coat, then cover and refrigerate overnight.Alternate cubes of meat with pepper squares, small onions, tomatoes and mushrooms.Place on charcoal grill, turning often until meat is done to your liking.