Cocoa Fudge Pie
["2 c. sugar", "4 egg yolks", "4 Tbsp. flour", "1/2 c. cocoa", "2 c. boiling water", "1 tsp. vanilla", "2 Tbsp. margarine"]
["Mix all ingredients except butter and vanilla and beat with wire whisk until thoroughly blended.", "Cook on low flame until slightly thickened, then add vanilla and margarine.", "Cook until thick.", "Pour into baked pie crust and top with meringue and brown."]
["sugar", "egg yolks", "flour", "cocoa", "boiling water", "vanilla", "margarine"]