Custard Filling - cooking recipe

Ingredients

3 Tbsp. flour
1/2 c. sugar
1/8 tsp. salt
1 c. milk
1 egg
1/2 tsp. vanilla
1 tsp. butter

Preparation

Combine dry ingredients thoroughly.
Add milk and eggs.
Cook over boiling water until thick like pudding.
Add vanilla and butter.
Mix well.
Cool.