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 remove excess moisture for better batter adhesion.
03 - Heat about 1/2 inch of vegetable oil in a large skillet over medium-high heat until shimmering hot.
04 - Dip each pineapple ring into the batter, allowing excess batter to drip off for even coating.
05 - Fry pineapple rings in batches for 1–2 minutes per side, or until golden brown and crispy. Do not overcrowd the pan to maintain oil temperature.
06 - Transfer fried pineapple to a plate lined with paper towels to drain excess oil. Serve warm with honey or maple syrup, toasted coconut, or vanilla ice cream if desired.