Beat eggs; stir in buttermilk, vanilla extract, and grated peel. Combine flour and baking powder. Stir into the egg mixture. Cover with a cloth. Let stand at room temperature for 1 hour. In a deep fryer, heat oil to 375 F. Drop batter by the tablespoon. Cook 4 minutes, or until doughnuts are golden brown. Drain on paper towels. Drizzle with honey and sprinkle with cinnamon. Serve hot. ABOUT 30 DOUGHNUTS Note: Batter keeps well in the refrigerator. Bring to room temperature before cooking.