Balsamic Marinated Roast Beef

1  cup		balsamic vinegar
5		cloves garlic,s chopped
1  tablespoon		black pepper
4  tablespoons		rosemary, chopped
1/4  cup		olive oil
3  lb.		beef, sirloin tip roast

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1.Place balsamic vinegar, chopped garlic and black pepper in a small saute pan over medium to high heat and reduce for 1-2 minutes.
2.Remove pan from heat, stir in rosemary and olive oil, allow to cool.
3.Place Balsamic Marinade in a baking pan, place beef in pan and coat with hands.
4.Place in fridge to marinate for a minimum of half an hour, maximum 24 hours.
5.Preheat oven to 450, remove marinated beef from fridge
and cook for 10 min, then lower to 350F and cook for 45 -60 min
until cooked medium rare with an internal temperature between 130F and 140F.
6.Remove beef from oven and allow beef to rest before slicing.