In a pan with hot oil add steak, season with salt and pepper. When steak is cooked add chorizo.
Fry for 8-12 minutes or until cooked.
Split the bolillo in half and spread a layer of La Costeña Refried Pinto Beans.
Add steak with chorizo, chopped onion and mozzarella cheese. Place molletes in the oven for 3-5 minutes or just until cheese has melted.
Top with sour cream and cilantro.