In this classic Provençal dish, summer vegetables, like eggplant, onions, peppers, tomatoes and zucchini, are covered in olive oil and roasted separately, then all together, until they become a soft, harmonious stew. This recipe calls for seeding and peeling the tomatoes, which is a bit of work. But it’s worth it for the intensity of flavour and the velvety texture. Ratatouille takes some time to make, and tastes better the next day, so plan ahead. The upside is that it’s a perfect make-ahead dish for a party. You can store it in the refrigerator for up to 5 days, then gently reheat it, or bring it to room temperature before serving.