01 - In a medium bowl, whisk together flour, cornstarch, sugar, cinnamon, and salt. Gradually add cold sparkling water, whisking until a smooth, thick batter forms.
02 - Pat pineapple rings dry with paper towels to ensure batter adheres properly.
03 - Heat about 1/2 inch of vegetable oil in a large skillet over medium-high heat until shimmering.
04 - Dip each pineapple ring into the batter, letting any excess drip off.
05 - Fry pineapple rings in batches for 1-2 minutes per side, or until golden and crisp. Avoid overcrowding the pan.
06 - Transfer fried pineapple to a plate lined with paper towels to drain. Serve warm, drizzled with honey or maple syrup, and topped with toasted coconut or a scoop of vanilla ice cream, if desired.