Southern Tomato Pie

3 tomatoes
1/2 teaspoon salt
1/4 teaspoon pepper
1/2 teaspoon italian seasoning
1/4 cup onions, chopped
2 cups cheddar cheese, shredded
1/2 cup mayonnaise
1 unbaked pie shell

Bake pie shell for 5 minutes at 425 degrees.
Place tomato slices in pie shell.
Combine seasonings with onion and sprinkle on tomatoes.
Mix mayonnaise and cheese and spread over top like meringue. Seal edges as much as possible.
Bake 350 degrees for 35 minutes. Cool 15 minutes before serving. (It is very important to allow pie to cool before trying to serve.).