1/2 c. salad oil
1/4 c. vinegar
1/4 c. chopped onion
1 tsp. coarsely ground or cracked pepper
2 tsp. Worcestershire sauce or steak sauce
2 lbs. round or chuck beef

Mix all ingredients and marinate for several hours, then place on skewers with chunks of tomato, green pepper, mushrooms and onions. Brush with marinade sauce and barbecue on a charcoal grill.