Maine Potato Donuts

1 cup sugar

2 eggs

3/4 cup milk

3/4 cup cold mashed potato

3 3/4 cups flour

1/4 cup melted shortening

1 teaspoon vanilla

4 teaspoons baking powder

3/4 teaspoon ginger

Mix sugar and eggs, add milk and potato. Add shortening and vanilla. Sift dry ingredients, add and mix well. Chill 1 hour before frying. Roll, cut out and fry in deep fat at 375.