Potato, Onion, And Tomato Gratin - cooking recipe

Ingredients

3 lbs baking potatoes, peeled and thinly sliced
3 large yellow onions, thinly sliced
2 lbs tomatoes, thinly sliced
sea salt, to taste
freshly ground pepper, to taste
1/2 cup olive oil
1 cup parmesan cheese, freshly grated

Preparation

Coat bottom and sides of a large oval glass or ceramic gratin dish with
olive oil.
Arrange a layer of 1/2 of potatoes in the dish.
Top with 1/2 of onions, then 1/2 of tomatoes.
Sprinkle with salt and pepper.
Drizzle with 1/4 cup olive oil.
Sprinkle with 1/2 of cheese.
Repeat process to use remaining ingredients.
Bake in a preheated 375-degree oven about 1 1/4 hours or until golden
and bubbly.
Serve hot with fish or meat.