01 - In a shallow dish, combine dark rum and brown sugar. Add pineapple pieces, turning to coat thoroughly. Let soak for 10-15 minutes, flipping halfway through to ensure even absorption.
02 - In a medium bowl, whisk together flour, cornstarch, and salt until well combined. Gradually whisk in cold sparkling water until a smooth, thick batter forms without lumps.
03 - Pour 1 inch of vegetable oil into a large skillet or deep pan. Heat over medium-high heat until temperature reaches 350°F (175°C). Maintain this temperature throughout frying.
04 - Remove pineapple from the rum mixture and pat lightly dry with paper towels to remove excess liquid. Dip each piece into the batter, allowing excess to drip off for even coating.
05 - Fry pineapple pieces in batches for 2-3 minutes per side until golden brown and crispy. Avoid overcrowding the pan to maintain proper oil temperature and ensure even cooking.
06 - Remove fried pineapple to a paper towel-lined plate to drain excess oil. Serve warm, drizzled with honey or maple syrup and sprinkled with cinnamon. Accompany with vanilla ice cream or whipped cream if desired.