Scald:
2 c. milk

Blend together and gradually add to milk stirring until blended:
1 c. sugar
1 T. flour
¼ tea. salt

Stirring constantly, cook mixture over direct heat 5 minutes.
Remove from heat and stir about 3 T. of hot mixture into: 3 Egg yolks slightly beaten

Immediately stir into hot mixture in top of double boiler.  Set over simmering water and cook, stirring constantly, about 10 minutes, or until mixture coats a silver spoon.  Remove and cool. 

Stir in:
2 cups cream
2 t. vanilla

Pour into an electric or hand ice cream churn.  Pack with ice and salt and proceed according to churn directions.
(For banana ice cream, add ¼ c. sugar, 1 c. banana pulp and 1/3 c. lemon juice.)