All you need is a grill and a food processor. No need to turn on stove or oven.
Slice your eggplant into medium thin slices. Brush with olive oil, season with salt & pepper. Grill until softened, imprinted with grill lines, and even charred a bit. Also grill two big tomatoes sliced in half, 1 large onion, peeled and sliced in half, and 2-3 cloves of garlic (keep them together so they don’t fall through the grill or hold together with skewer). Pulse the grilled tomatoes, onion, and peeled grilled garlic cloves in the food processor until you have a smooth sauce (or chunky if you like). Season with salt & pepper. Spoon some sauce in the bottom of a casserole dish (I use an alimunum one since it’s going back on the grill). Place a layer of eggplant slices on top, spoon some sauce, sprinkle grated parmigiano, scatter cubes or slices of mozzarella. Repeat in one or two more layers. Place back on a very low grill (or use top grate away from direct heat if you have one). Close cover and cook until cheese melts and is bubbling.
Now pour a glass of cool Italian white wine (Frascati? Pinot Grigio? Soave?) and enjoy…preferably outoors in a garden fragrant with basil and ripening figs. 🙂