Gigi's Boiled Custard

This is a Jones family tradition and my Dad makes tons of it every Christmas. We've never tasted a better boiled custard :)

Ingredients:

2 cups milk

½ cup sugar

1 tsp. flour

1 egg, beaten

1 tsp. vanilla

Directions: Bring the milk to “just before boil” in top of the double boiler. Mix sugar and flour, add the egg. Add milk slowly to the egg, whisking constantly. Stir in the vanilla. Return the custard to the top of the double boiler to cook until thickened. (Mixture should coat a spoon)