1 (7 oz.) bottle diet 7-Up
1 T. lemon juice
1/4 C. finely chopped onion
1 clove garlic, minced
1 1/2 tsp. salt
1/4 c. salad oil

Combine all ingredients. Place steak in shallow dish and pour marinade over top. Cover and place in refrigerator for several hours or overnight. Turn steak once or twice to distribute marinade evenly. Brush steak with marinade several times during grilling. Makes about 1/2 C. marinade.