01 - Pat the pineapple rings dry with paper towels to remove excess moisture. Set aside on a clean plate.
02 - In a mixing bowl, whisk together flour, cornstarch, sugar, baking powder, and salt until thoroughly combined.
03 - Add chilled sparkling water, coconut milk, and vanilla extract to the dry ingredients. Whisk until you achieve a smooth, thick batter without lumps.
04 - Heat vegetable oil in a deep saucepan or fryer to 350°F. Use a kitchen thermometer to ensure proper temperature.
05 - Dip each pineapple ring into the batter, turning to coat completely. Allow excess batter to drip off for even frying.
06 - Carefully lower battered rings into hot oil, frying 2–3 at a time. Cook for 2–3 minutes per side until golden brown and crispy.
07 - Remove fritters with a slotted spoon and drain on paper towels. Dust generously with powdered sugar and sprinkle with toasted coconut if desired. Serve immediately while warm.