Rich Custard Filling

Ingredients:

1/2 cup sugar
1/2 teaspoon salt
1/3 cup all purpose flour
2 cups whole milk
4 egg yolks, or two eggs, beaten in a medium bowl
2 teaspoons vanilla extract, or other flavoring

Directions:
In a heavy bottomed saucepan, combine the sugar, salt and flour. Stir in the milk. Cook over medium heat, stirring constantly, until it boils. Boil 1 minute. Remove from the heat. Stir half of this hot custard into the bowl containing the egg yolks to partially cook it. Pour the entire mixture back into the saucepan. Bring just to a boil, before removing from the heat. Cool slightly. Blend in extract or other flavoring.
Hints:
Delicious filling for cream puffs or éclairs. Serve with an appropriate sauce: chocolate, fruit, etc..