"This recipe is adapted from one in Top Pot Hand-Forged Doughnuts: Secrets and Recipes for the Home Baker. Old-fashioned doughnuts are fried at a lower temperature than other doughnuts and turned twice while frying, which gives them their characteristic crunchy petals and grooves—perfect for holding onto a sweet glaze (recipe included below). The sour cream in the dough keeps these doughnuts wonderfully moist. Note: For super extra tender doughnuts, use cake flour. But they really are plenty tender and delicious with regular old all-purpose flour, too. You might also like these Homemade Raised Doughnuts or Whole Wheat Doughnuts...."