Harissa Sauce: Soak a few dried hot chilies in cold water for an hour. Split the chilies and remove the stems and seeds. Pound in a mortar with 2 or 3 tablespoons of caraway seeds, a garlic clove, and some coarse salt until it forms a paste. Mix in enough olive oil to make the paste fluid. Refrigerate.
Storage: Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat gently with a splash of water to refresh the couscous.
Variations: You can add other seasonal vegetables like eggplant or sweet potatoes to the stew.