1. Mix sugar, flour, cornstarch, and salt in upper part of a double boiler or in a heavy-bottomed saucepan.
2. Gradually add scalded milk. Stir until mixture thickens; cook about 10 minutes. It is important that this mixture becomes very thick, almost like paste, or the pie will be runny.
3. When the mixture is very thick, remove pan from heat. Add a spoonful or two of the hot filling to the egg yolks and mix to temper the eggs (this helps warm the yolks slightly so they won’t cook or “scramble” when added to the hot cream filling). Add the tempered yolks into the cream filling and return the pan to the heat. Cook 2 minutes, stirring constantly.
4. Remove pan from heat. Add butter and vanilla extract. Let cool 5 minutes or more, then pour into the pre-cooked pie shell.
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