Please read About Doughnuts.
Whisk together in a medium bowl until thoroughly mixed:
Beat well in a large bowl with an electric mixer:
Add slowly and beat until thick and creamy:
On low speed, add and beat until blended:
Mix the wet ingredients into the flour mixture with a spoon just until blended. The dough will be soft and sticky. Cover the bowl tightly with plastic wrap and refrigerate for at least 2 hours and up to 24 hours.
Roll out the dough on a lightly floured surface to ½ inch thick and cut out the doughnuts. Let them rest, loosely covered with oiled plastic wrap, for 30 minutes.
Heat to 365°F in a deep-fryer, deep heavy pot, or Dutch oven:
Fry in batches, flipping halfway through, until golden, about 4 minutes. Drain briefly on a baking sheet lined with paper towels, turning them to blot fat from the second side. While still warm, toss in a bowl with:
Or let cool and glaze with: