Broiled flank steak

1 tbsp. butter or margarine
2 medium onions, thinly sliced
1/4 tsp. salt
2 tbsp. salad oil
1 tsp. lemon juice
2 cloves garlic, crushed
1/2 tsp. salt
1/4 tsp. pepper
2 lb. high-quality flank steak, scored
6-8 servings
Melt butter in skillet. Cook and stir onions and 1/4 tsp. salt in butter until onions are tender. Keep warm over low heat.
Stir together salad oil, lemon juice, garlic, 1/2 tsp. salt and the pepper; brush on top side of meat. Set oven to broil and/or 550F. Broil meat 2 to 3 inches from heat about 5 minutes until brown. Turn meat; brush with oil mixture and broil just until rare, 5 minutes longer.
Cut meat across grain at a slanted angle into very thin slices; serve with onions.