Double Decker Pastry
["5 c. flour", "1 c. sugar", "4 tsp. baking powder", "2 tsp. baking soda", "1/2 lb. butter or margarine", "2 Tbsp. vegetable shortening", "4 egg yolks", "1/2 pt. sour cream", "1 tsp. vanilla", "pinch of salt", "10 oz. ground nuts (walnuts or pecans)", "1/2 c. sugar", "prune filling or thick jam"]
["Sift together flour, sugar, baking powder and soda and salt. Add shortening.", "Add egg yolks, sour cream and vanilla.", "Blend until dough forms.", "Divide into 3 portions.", "Roll between waxed paper as for jelly roll.", "Remove paper."]
["flour", "sugar", "baking powder", "baking soda", "butter", "vegetable shortening", "egg yolks", "sour cream", "vanilla", "salt", "ground nuts", "sugar", "filling"]