Newspaper Pastry Crust

I cut this out of a newspaper over 40 years ago. It is still taped into the loose leaf cookbook my mother gave me. This is the crust for a Latticed mushroom tart which is absolutely fabulous.

2 3/4 C flour
pinch of salt
1/2 C butter, cut up
1/2 C solid vegetable shortening
1 egg
1 teaspoon distilled white vinegar
1/2 C. ice water

To make pastry, sift flour and salt into a bowl and add butter and shortening. Combine with a metal palette knife or pastry blender until the mixture resembles bread crumbs.
Mix egg, vinegar and water, add flour and cult the liquids in until mixture comes together and forms a dough. Knead on a lightly floured board a few times, then divide in half and wrap each piece in plastic film. Refrigerate 15 minutes.