Chocolate Pie 2

3/4 c. sugar
1/2 c. flour
1/4 tsp. salt
3 Tbsp. cocoa
3 egg yolks
2 c. milk
3 Tbsp. margarine
1 tsp. vanilla

Cook first six ingredients until thick over low heat. Mixture will thicken quickly, if lumpy, beat with mixer until smooth. Add margarine and vanilla. Pour into baked pie crust. Top with meringue and bake until meringue browns.