Peel and slice the garlic. Wash herbs and shake dry. Pluck needles roughly. Pluck sage leaves from the stems. Wash the chillies, cut them in half lengthwise and remove the seeds. Cut the pod into small pieces. Put garlic slices, rosemary, chilli, sage and 2 tbsp. olive oil in an ovenproof dish.
Red mullet scales and wash out from inside and outside. Dab dry and season with salt and pepper. If necessary, place the fish slightly offset on the herbs. Put 4 tablespoons of olive oil and olives into the dish. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 15 minutes, turning once
Wash and clean the aubergine and cut into thin slices. Spread the grill pan with oil. Grill aubergine slices in it in portions, season with salt and pepper. Arrange fish and aubergines and serve immediately