Aunt Lydia's Apple Cake

DIRECTIONS

1. Preheat oven to 350 degrees F (175 degrees C).
2. Sift flour and salt together into a medium bowl. Cut in butter as for pie crust to pea sized pieces. Set aside.
3. Put warm water and 1 teaspoon sugar in a large bowl. Add yeast. Let dissolve. Add slightly beaten egg yolks to yeast mixture.
4. Add flour mixture and gently mix until mixture forms a ball. Divide in half. Use one-half for bottom and one-half for top crust. Roll out one crust to fit a 9x13 inch ungreased pan. Sprinkle tapioca over dough.
5. Fill with sliced apples, piled high. Sprinkle with mixture of 3/4 cup sugar and 1 teaspoon cinnamon.
6. Roll top crust to fit pan. Put top over apples, seal in around pan, tucking top under (do not flute). Do not prick.
7. Bake at 350 degrees F (175 degrees C) for 45 minutes. While still slightly warm, frost with butter frosting.