1. Coat the bottom of a gratin dish with a layer of cooked tomato coulis.

2. Arrange a layer of sautéed zucchini slices in overlapping rows on top. Sprinkle with grated cheese.

3. Continue adding layers of zucchini, coating each layer with tomato sauce and sprinkling with grated cheese.

4. Bake at 375 degrees F until golden brown on top.