Peel the garlic and cut into slices. Halve the peppers, clean, wash and cut into large, longish pieces. Peel onions and cut into slices. Peel and wash potatoes and cut them lengthwise into halves or quarters, depending on their size.
Wash the rosemary, remove the needles from the branch.
Mix the vegetables, potatoes and herbs, season with salt and pepper and place in an ovenproof dish. Pour on the stock. Drizzle with olive oil. In a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) cook for about 45 minutes. Crumble the sheep's cheese finely. Remove the mould from the oven and arrange. Sprinkle olives and sheep's cheese over the casserole.