Fletch'S Flank Steak

Directions

1. 1
   Saute onion in olive oil until golden.
2. 2
   Add garlic; cook for 2 minutes.
3. 3
   Stir in red wine vinegar; reduce by half.
4. 4
   Add wine and beef broth; simmer for 5 minutes.
5. 5
   Cool marinade and pour over flank steak placed in a glass or ceramic dish.
6. 6
   Marinate in the refrigerator for 48 hours, turning steak every 12 hours.
7. 7
   Grill flank steak and baste using marinade.
8. 8
   Strain remaining marinade. Warm and serve as sauce.