Polish Doughnuts - cooking recipe

Ingredients

1 pt. (16 oz.) milk, scalded
1 large cake yeast (2.0 oz.) or 4 dry yeast packets
2 c. flour
4 egg yolks
1 egg
1/2 c. sugar
1/2 c. melted shortening
1/2 tsp. vanilla
1 tsp. salt
grated rind from 1 orange or 1 1/2 tsp. orange zest
approximately 5 c. flour

Preparation

Scald milk and cool to 120\u00b0.
Add yeast and 2 cups flour.
Let this mixture stand for 1/2 hour to form a sponge.