How to Make Doughnuts from Scratch?

Mix together 1 cup shortening, 1 cup sugar, 1 1/2 tsp salt, 1 qt scalded cooled skim milk, 1 cup mashed potatoes, 6 eggs and 11 cups flour. Let rise 2 times, then roll out and cut and put on wax paper. Let rise again, fry in deep fat and glaze.