01 - If using fresh pineapple, peel, core, and slice into 1/2-inch thick rings. Pat rings thoroughly dry with paper towels to remove excess moisture for better batter adhesion.
02 - In a medium bowl, whisk together flour, cornstarch, sugar, baking powder, and salt until well combined. Stir in cold sparkling water and egg (if using) until just combined—do not overmix as this affects the final texture.
03 - In a deep skillet or saucepan, heat vegetable oil to 350°F. Use a kitchen thermometer to ensure proper temperature for optimal frying results.
04 - Dip each pineapple ring into the batter, allowing excess batter to drip off. Ensure even coating while preventing excessive buildup that can lead to greasy results.
05 - Carefully place battered rings into the hot oil, working in batches to avoid overcrowding. Fry for 1–2 minutes per side until golden brown and crispy. Remove with a slotted spoon and drain on paper towels.
06 - Dust warm fried pineapple rings generously with powdered sugar and add a sprinkle of cinnamon if desired. Serve immediately while still crisp, optionally accompanied by vanilla ice cream or warm caramel sauce.