Buttermilk Cream Pie
["1 1/2 c. sugar", "3 Tbsp. flour (heaping)", "2 egg yolks, slightly beaten", "1 (9-inch) baked pie shell", "2 c. buttermilk", "2 Tbsp. margarine", "1 tsp. vanilla"]
["Mix together sugar, flour, egg yolks and buttermilk.", "Beat at low speed with mixer until all ingredients are mixed.", "Pour into a heavy saucepan and add margarine and vanilla.", "Cook until boiling and stir constantly until thick.", "Pour into prepared pie shell. Cool; top with meringue or Cool Whip."]
["sugar", "flour", "egg yolks", "shell", "buttermilk", "margarine", "vanilla"]