Bread crumbs, pan grattato are just grated bread. Let your country loaf go stale and grate it on the fine or medium holes of your grater, then toast the crumbs in the oven or in a pan on the stove to dry them fully. Italian grandmothers differentiate between using truly stale bread, which produces very fine crumbs, and fresher bread with the crust cut off, which, when processed to coarse crumbs and dried in the oven, produces softer fuller crumbs.