1/2 c. vegetable oil
1/4 c. soy sauce
1/4 c. vinegar
1/2 tsp. pepper
2 lbs. sirloin tip roast cut into 2 inch cubes
6 to 8 boiling onions
1/2 lb. fresh mushrooms
1 c. cherry tomatoes
1 lg. green pepper, cut into 1 inch pieces

Combine oil, soy sauce, vinegar and pepper in large shallow container. Add meat, cover and marinate in refrigerator 4 hours or overnight. Parboil onions 3 to 5 minutes; drain. Remove meat from marinade. Alternate meat and vegetables on skewers. Grill kabobs 5 minutes on each side over medium coals or until desired doneness, basting with marinade.