Early in the sixteenth century, chiles were transferred from Portuguese Brazil to their colony of Angola. These small, piquin-like chiles (which were probably Brazilian malaguetas) were called piri-piri (pepper-pepper) and became an integral part of the local cuisine. The sauce made from them was transferred back to Portugual, where it is a staple on dining tables--served with seafood, soups, and stews. Since the piri-piri chiles are not usually available, use chiles de árbol, cayenne chiles, chile piquins, or chiltepíns. Note: This recipe requires advance preparation.