1 tablespoon of milkPreheat the oven to 375 F. in a 10 inch skillet cook the mushrooms, onions, and ground beef over medium/high heat, stirring occasionally until nicely browned (12 to 15 minutes).
Drain off fat. Stir in remaining stroganoff ingredients; cook over medium heat until cream cheese is melted ( 3 to 4 minutes).
In large bowl stir together flour and minced onion, one teaspoon of salt, sugar and 1 teaspoon pepper. Cut in the butter and shortening until crumbly. With a fork, mix in one egg and water until flour is moistened. Divide dough in half; shape into two balls and flatten. Wrap one ball in plastic wrap; refrigerate.
On lightly floured surface roll out other ball into 14 inches square. Place in a 9 inch square baking pan. Trim pastry to ½ inch from the rim of the pan. Fill with stroganoff mixture.
Roll remaining pastry ball into 14 inch square; place over stroganoff mixture. Trim pastry to ½ inch from the rim of the pan. Roll edges of dough under to form a rim inside of pan; crimp or flute the crust.
With a sharp knife, cut an X in each 3 inch square of pastry to decorate 9 squares. In a small bowl stir together 1 egg and milk; brush over pastry.
Bake for 35 to 40 minutes or until the crust is golden brown. Let stand for 5 minutes; cut into squares.
Hamburg steak recipes are wonderful and easy to make for the family meal.