Old Fashioned Buttermilk Doughnuts

4 c sifted flour
3 tbsp baking powder
1 tsp salt
1/2 tsp nutmeg
2 eggs plus 1 egg yolk
2.5 to 3 lbs Crisco or oil for frying
2 c sugar
1/2 tsp vanilla
1/2 tsp soda
3/4 c buttermilk
2 tsp melted shortening

Sift together flour, baking powder, salt and nutmeg. Beat egg and yolk. Add sugar gradually and beat. Add vanilla, stir soda in the buttermilk. Add to egg mixture. Stir in cooled shortening and the flour mixture. Dough will be quite soft. Cover and chill at least 1 hour. Roll out to 1/2 inch thick and cut with floured cutter. Place on wax covered cookie sheet. Keep cool until ready to fry. In deep broad kettle, place about 1.5 inches cooking oil. Heat to about 360 degrees. Fry 4 or 5 doughnuts at a time, turning often. When golden brown and done, (4 or 5 minutes) remove from fat.