Best-Ever Cheesecake
["1 c. sifted enriched flour", "1/4 c. sugar", "1 tsp. grated lemon peel", "1/2 c. butter or margarine", "1 slightly beaten egg yolk", "1/4 tsp. vanilla"]
["Combine flour, sugar and lemon peel. Cut in butter until mixture is crumbly. Add egg yolk and vanilla; blend well. Pat 1/3 of dough on bottom of 9-inch spring-form pan (sides removed). Bake at 400\u00b0 about 6 minutes or until golden; cool. Butter sides of pan; attach to bottom. Pat remaining dough evenly on sides to a height of 2-inches."]
["flour", "sugar", "butter", "egg yolk", "vanilla"]