Preheat the oven to 350 degrees.
In a large bowl, mix the flour and salt.
Cut in the shortening and butter until mixture resembles peas.
Add in the ice water a little at a time, working with your hands to form a dough. Be careful not to overmix the dough.
Divide the dough in half and roll each piece into rounds approximately 9 to 10 inches in diameter.
Cut each round in half to use for the pasty.
Or, you could do like I do and buy ready-made pie crust. Roll it out and cut each circle in half.
Combine the steak, onion, potato and cheese in a bowl. Mix well.
Divide the filling between the four pie crusts, spooning the mixture a lttle off-center in the dough.
Beat the egg and brush the edges of the pie crust.
Fold the dough in half with the filling inside, crimping the edges well.
Brush the top and the sides of each pasty with the remainder of the beaten egg.
Bake on a greased baking sheet for 40 minutes or until the top and edges are golden brown and flaky.