2-1/2 cups all-purpose flour 1/2 cup cornstarch 1/4 cup sugar 3 tablespoons baking powder 1 tablespoon ground red pepper 2 teaspoons salt 2 cups club soda Vegetable oil for frying 2 large sweet yellow onions, cut into 3/8- inch-thick slices and separated into rings.
In a large bowl, combine the flour, cornstarch, sugar, baking powder, ground red pepper, and salt; whisk in the club soda.In a large saucepan, heat 2 inches of oil over medium heat until hot but not smoking. Dip each onion ring into the batter, allowing the excess to drip back into the bowl. Fry a few rings at a time for 5 to 6 minutes, or until golden. Drain on a paper towel-lined platter before serving.
