Rosemary and Garlic Roast Beef

Name: Rosemary and Garlic Roast Beef
Prep time: 15 min
Cook time: 1 h 30 min
Total time: 1 h 45 min
Cuisine: European
Ingredients: 3lbs boneless Rib Eye roast; 1/4 cup chopped Fresh rosemary, or other favorite herbs; 1/4 cup chopped garlic (about 20 cloves); Salt and freshly ground pepper to taste; 4 tablespoons olive oil, divided; 4 tablespoons butter, divided; 4 cups of a variety of Mushrooms, sliced to about the same size; 1 cup of stock