Preparation:
Heat oven to 4250 F. Beat egg yolks until light; gradually add sugar, continuing to beat. Fold in flour and buttermilk alternately. Stir in vinegar, vanilla, and melted margarine. Beat 4 egg whites until fairly stiff peaks form; fold into yolk mixture. Pour into pie shell; sprinkle with cinnamon. Bake for 10 minutes; reduce heat to 3250 F and bake until firm, about 20 minutes. Cool before serving. |
