"Harissa is a hot chili paste that is commonly found in North African cooking, mainly Moroccan, Algerian, and Tunisian cuisine. It is added to couscous, soups, pastas and other recipes. It can also be purchased in Middle Eastern stores in a can. For a very spicy harissa: use a blend of cayenne, chile de arbol, or cayenne with a milder chile like ancho chilies For a medium spiciness: use a blend of New Mexico chilies with guajillo chilies..."