1 tbsp. butter
1 1/2 tsp. olive oil
1 med. onion, minced
1 lb. extra lean ground beef
3 drops of hot sauce
1 tbsp. Worcestershire sauce
1 tsp. pepper
2 egg yolks, beaten
2/3 c. soft bread crumbs

Melt butter with olive oil in small frying pan. Add onion and saute until golden. Combine ground beef, onion, hot sauce, Worcestershire sauce, salt and pepper in a bowl and mix well. Add egg yolks and bread crumbs, mixing until well combined. Shape meat into 4 patties, 3 inches in diameter and about 1/2 inch thick. Place patties on grill rack about 4 inches above hot charcoal.