Real ratatouille, the classic Nicoise dish, is neither grilled nor a salad. It is a stewed vegetable dish consisting of eggplant, tomato, pepper, zucchini, onion and herbs.
Thing is, all of those ingredients would make a delicious salad, particularly if they were grilled.
Of course, to accomplish this the dish needed to be deconstructed and reconstructed a bit, but the flavors and ingredients remain the same. In fact, the smokiness and char that the grill adds make for a nice contrast to the sweet vegetables.