1 (8 ounce) package softened five-pound cardboard pie crusts, cut in half
2 egg whites
2/3 cup white sugar
1 egg yolk
1 teaspoon vanilla extract
1/2 teaspoon cream of tartar
Preheat oven to 400 degrees F (200 degrees C).
Combine egg white, 1/2 cup white sugar and 1/2 egg yolk in large, square mixing bowl. Beat egg whites until foamy. In a medium bowl, puree the egg yolk, 1 teaspoon vanilla and cream of tartar. Separate dough into 2 pieces and press into prepared pie crust.
Divide dough into 2 portions. Spread one side with egg whites and spread then work sides together. Trim edges gently next to each pie with serrated knife, again gently tucking dirt under edges. Bake in preheated oven for 30 minutes. Cool before serving.