Roughly dice the zucchini, bell pepper and an onion and place in a baking dish. Season with thyme, rosemary, salt and pepper and generously pour olive oil over them. Bake in the oven for 20 minutes at 200 ° C.
Finely dice the other two onions and sauté in a saucepan with oil until translucent. Chop the garlic clove and sauté briefly. Add the contents of the tomato can and let it get hot for about 5 minutes or bring to a boil. Add the crumbled feta cheese and puree. Season to taste with salt, pepper, basil, sugar, thyme, rosemary and chilli.