Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
2                       eggs -- separated
1/2       cup           sugar
1/2       cup           milk
2         tablespoons   flour
1         teaspoon      vanilla extract
                        plus vanilla extract to taste

Preparation:

In the top pan of a double boiler, combine egg yolks, sugar, milk, flour, and the 1 teaspoon vanilla. Whisk to blend, then place over gently boiling water and cook, stirring, until mixture is thickened and coats the back of a spoon. Remove from heat and let cool to room temperature. In a bowl beat egg whites until stiff peaks form. Gently fold egg whites into custard. Add vanilla to taste.