1 1/2 tsp. salt
1 clove garlic, smashed (or pressed)
3 tbsp. prepared mustard
3 tbsp. lemon juice
1 tbsp. Worcestershire sauce
Freshly ground black pepper to taste
1-1 1/2 lbs. flank steak
1 lg. onion, sliced in rings

Combine first 6 ingredients. Pour over flank steak, covering both sides. Cover with onion rings and marinate in a closed container overnight. Remove onion rings and enough marinade to make it easy to grill. Grill for 6 minutes on each side. Slice thin on the diagonal.