French Onion Pizza au Gratin

Directions

1. In a large skillet, saute onion with brown sugar in 1 tablespoon oil until softened. Reduce heat to medium-low; cook, stirring occasionally, for 30 minutes or until deep golden brown. Stir in vinegar and garlic. Remove from the heat; add bourbon if desired. Continue cooking until liquid is nearly evaporated.
2. In another skillet, saute mushrooms in remaining oil until tender; add roast beef and heat through.
3. Place crust on a pizza pan; spread with French onion dip. Layer with mozzarella cheese, onion mixture, red pepper, mushroom mixture and Gruyere cheese.
4. Bake at 425° for 10-15 minutes or until cheese is melted. Sprinkle with rosemary.