Xató is a simple Catalan sauce made with breadcrumbs, garlic, hazelnuts, almonds, vinegar, olive oil, dried nyora peppers, and a bit of salt. It is traditionally prepared in a mortar, but home cooks can easily make it in a blender. Originally, xató comes from the Garraf and Penedès regions, where it is usually prepared for the Carnival and used as an accompaniment to different varieties of filled omelets.