01 - If using fresh pineapple, peel, core, and slice into 1/2-inch rings. Pat rings thoroughly dry with paper towels to remove excess moisture for better batter adhesion.
02 - Whisk together flour, cornstarch, sugar, baking powder, and salt in a medium bowl. Stir in cold sparkling water and egg (if using) until just combined. Do not overmix—small lumps are acceptable.
03 - Pour vegetable oil into a deep skillet or saucepan to a depth of 2 inches. Heat to 350°F, maintaining consistent temperature throughout frying.
04 - Dip each pineapple ring into the batter, allowing excess batter to drip off. Ensure even coating while preventing buildup that could cause uneven cooking.
05 - Carefully place battered rings in 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. Optionally sprinkle with ground cinnamon and serve immediately with vanilla ice cream or caramel sauce for an enhanced dessert experience.