Beef Filets In Balsamic Sauce

• 4 Tbsp Extra Virgin Olive Oil
• 4 Tbsp Butter
• 1 Yellow onion, medium and sliced thin
• pinch Salt
• pinch Black pepper
• 1/2 cup(s) Dry white wine
• 1/2 cup(s) Marsala wine
• 1/2 cup(s) Beef broth
• 2 Tbsp Balsamic vinegar
• 6 Beef Tenderloin filets (6 oz each)
• dash Parsley, finely chopped
• 6 Fresh rosemary sprigs

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

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Taken from www.epicurious.com/recipes/member/views/beef-filets-in-balsamic-sauce-1273491 (may not work)