Potato, zucchini, and tomato gratin
Instructions:
- Preheat the oven to 375F, with the rack in the upper third. Coat a 9 by 13-inch gratin dish with 1 teaspoon oil, and sprinkle with the garlic. Using a mandoline or a very sharp knife, slice the potatoes and zucchini as thinly as possible into rounds. Arrange the potatoes, zucchini, and tomatoes in overlapping layers around the prepared dish, and sprinkle with the salt and pepper. Drizzle with the remaining 4 teaspoons oil, and sprinkle with the thyme and cheese.
- Cover with foil; bake until the potatoes are tender, 35 to 45 minutes. Remove the foil; continue baking until the top is golden brown, about 25 minutes more. Remove from the oven, and serve immediately.