STEP - 1
In a small saucepan, bring cider to a rapid boil; cook over high heat until reduced by half, about 12 minutes. Cool completely.
STEP - 2
Whisk together flour, brown sugar, baking powder, salt, baking soda and spices. In a separate bowl, whisk eggs, melted butter and cooled cider; stir into dry ingredients just until moistened (dough will be sticky). Refrigerate, covered, until firm enough to shape, about 1 hour.
STEP - 3
Divide dough in half. On a floured surface, pat each portion to 1/2-in. thickness; cut with a floured 3-in. doughnut cutter.
STEP - 4
In an electric skillet or deep fryer, heat the oil to 325°. Fry doughnuts, a few at a time, until golden brown, 2-3 minutes on each side. Fry doughnut holes, few at a time, until golden brown and cooked through, about 1 minute on each side. Drain on paper towels; cool slightly. If desired, dip doughnuts into glaze or sugar of your choice.