cook pie crust until almost done and get out of oven. put a layer of tomatoes on pie crust. add half of the onion, pinch of salt and pepper and basil. add 1/4 of your cheese and put another layer of tomatoes.
mix your mayo,cheese,salt,pepper,basil,onion and garlic together in a bowl and spoon mixture over the top of the pie. cover the whole pie with mixture. bake in oven for about 25mins on 375.