1 c  Milk
1/4 c  Sugar
1 1/2 tb Corn starch
1/8 ts Salt
1    Egg yolk
1/2 ts Almond or vanilla essence
(or other flavour)
1/2 tb Butter or margerine

Scald milk in top of double boiler. Mix together sugar, corn starch &
salt; pour hot milk over this mixture; stir, return to double boiler,
cook over boiling water until thick. Cover & continue cooking for 15
minutes, stirring occasionally. Beat egg yolk lightly and pour hot
mixture over it, mix well. Return to double boiler and cook for 3
minutes. Remove from heat, add flavour and butter, mix well. Cool
before using. Makes enough to fill 9 inch layer cake.