Heat about 3 inches of oil in a deep heavy pot, fitted with a deep-frying thermometer, to 365 degrees F.
In a large bowl combine the potato, ricotta, sugar, salt and pepper, to taste, with a hand mixer until smooth. Fold in the flour, a little at a time, until just combined.
Working in batches to avoid crowing the pot, drop heaping teaspoons of the batter into the hot oil. Fry until golden brown, turning as needed to brown evenly, about 1 to 2 minutes. Drain on paper towels and dust with confectioners' sugar and a pinch of salt. Arrange them on a serving dish and enjoy!
Cook's Note: Be sure to let the oil return to 365 degrees F between batches.