Grease a baking dish with oil. Lay out dough sheets and place inside baking dish, overlaying them as needed. Let excess hang over edges and brush dough with oil.
Preheat oven to 200°C (approximately 400°F).
Rinse, trim and cut tomatoes into slices. Peel garlic and press into a bowl. Stir in ricotta, lemon juice, lemon zest and season with salt and pepper. Spread over dough. Top with tomato slices and thyme. Sprinkle with cheese and fold over excess dough. Bake until golden brown, about 25 minutes, and serve warm.