01 - If using fresh pineapple, peel, core, and slice into 1/2-inch rings. Pat rings thoroughly dry with paper towels to ensure batter adheres properly.
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 may affect crispiness.
03 - Pour vegetable oil into a deep skillet or saucepan to a depth of 2 inches. Heat to 350°F, maintaining temperature throughout frying for optimal results.
04 - Dip each pineapple ring into batter, turning to coat completely. Allow excess batter to drip off briefly before frying to prevent clumping.
05 - Carefully place battered rings in hot oil, working in batches to avoid overcrowding. Fry for 1–2 minutes per side until golden brown and crispy. Remove with slotted spoon and drain on paper towels.
06 - Dust warm fried pineapple rings generously with powdered sugar. Optionally sprinkle with ground cinnamon and serve immediately with vanilla ice cream or caramel sauce for a complete dessert experience.