1 cup butter, or margarine
1 cup canned tomato sauce
2 eggs
10 ounces ground beef
1 teaspoon dried oregano
3 cups shredded Swiss cheese
1 cup chopped shallots
1 (15 ounce) can sliced mushrooms, drained
1/2 cup chopped green onions
1/2 cup chopped hot pepper
2 tablespoons unsalted butter
2 teaspoons Worcestershire sauce
2 teaspoons prepared horseradish
1 teaspoon lemon zest
3 tablespoons minced onion
Preheat oven to 350 degrees F (175 degrees C). Grease and flour 2 (9 inch) round pie pans.
In a large mixing bowl, beat butter, tomato sauce, eggs, beef, oregano, Swiss cheese, shallots, mushrooms, green onions and hot pepper. Stir in horseradish, horseradish, lemon zest and onion. Pour mixture over pie and sprinkle 1 (1 ounce) teaspoon horseradish over all.
Bake for 60 minutes in the preheated oven, or until a large knife inserted in the center comes out clean.