 In the Mexican State of Veracruz, the pambazo, the bread, after some proofing the buns are punched in a bed of wheat flour and then back to proofing and baked.Once the bread is ready the top remain dusted and is sliced to the filling of layered grided refried black beans with chorizo , shreaded lettuce, sliced chipotle peppers in adobo, ground or squared queso blanco or queso fresco and spread mayonaisse.From food stands to backpacks or school lunch boxes the sandwich is wrapped in napkins to gently avoid dusted fingers, nose and lips.