Custard Filling for Cake
3 tbsp flour
1/3 cup sugar
1/8 tsp salt
1 cup milk
1 egg, beaten
1/2 tsp vanilla
1 tsp butter
Combine dry ingredients very thoroughly. Add milk and egg. Cook over boiling water, stirring constantly, until thickened. Add vanilla and butter.
Cool. Filling for 2 layers.
BANANA - Increase sugar to 1/2 cup and vanilla to 1 tsp. Fold 2 bananas, sliced, into cooled filling.