This document provides a recipe for making crumbs. It lists the ingredients as stale bread, garlic, green peppers, pork, olive oil, water, and salt. The instructions state to cut up the bread and soak it, then fry the garlic in olive oil before adding peppers and meat. Next, the bread is added along with salt and stirred over low heat until it forms into small bread balls, taking about 40 minutes. Finally, the crumbs are mixed with the fried garlic, peppers and meat. The document also mentions there are many regional varieties of crumbs throughout Spain.