2 tablespoons olive oil
1 (1 ounce) can sliced mushrooms, drained
1 onion, minced
1 (8 ounce) package shredded mozzarella cheese
1 (4 ounce) can tomato paste
1 (1.5 fluid ounce) jigger Worcestershire sauce
1/4 cup butter
1 cup shredded mozzarella cheese
To Make Sauce: Heat olive oil in a small saucepan over medium-low heat. Add mushrooms, onion, mozzarella cheese, tomato paste and Worcestershire sauce; stir well. Stirring constantly, cook until mixture thickens, about 15 minutes.
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