1. SAUCE: Heat oil and butter in a large saute pan over medium heat. Add sliced onions, salt, and pepper; cook 10 minutes or until softened and golden browned, stir frequently. 2. Add both wines, broth, vinegar and bring to a boil. Reduce heat and simmer for 10-15 minutes or until sauce is reduced by half. 3. BEEF: Lightly rub filets with oil; season with salt and pepper. Grill to preferred temperature. Place onions and sauce on a platter and top with steaks. Garnish with parsley and rosemary. ---------------------------------------------------------------------------
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