Milk Pie - cooking recipe

Ingredients

3/4 C sugar
1/3 C flour
2 C milk
3 eggs, separated
2 tsp. vanilla extract
1/4 tsp. cream of tartar
1/4 tsp. salt
2 Tbsp. butter
1 9-inch baked pie shell

Preparation

Combine sugar, flour, & salt in saucepan. Stir in milk gradually & cook 2 minutes over medium heat until bubbly. Stir constantly. Remove from heat. Stir hot mixture into slightly beaten egg yolks. Cook for 2 minutes longer. Add butter
& 1 tsp. vanilla, mixing well. Pour into baked pie shell.