This recipe provides instructions for making a fish tagine served over couscous with a carrot salad. The tagine is made with plaice fillets simmered in a sauce of passata, olives, harissa, and preserved lemon. Couscous is cooked with lemon and mint. For the salad, grated carrots, clementine slices, coriander, olive oil, and harissa-marbled yogurt are tossed together. The tagine, couscous, and salad are served together.