Basic Pie Filling - cooking recipe

Ingredients

1 c. sugar
1/3 c. flour
2 c. milk
2 egg yolks
pinch of salt
1 tsp. vanilla
1 Tbsp. butter

Preparation

Mix the sugar and flour; add enough milk to make a thick paste.
Add egg yolks and beat.
Add remaining milk and salt; mix well.
Cook in double boiler until thick.
Remove from heat and add butter and vanilla.