1. Start by peeling and coring your fresh pineapple. Slice it into rings about 1/2 inch thick. If you have little helpers in the kitchen, this is a fun task for them—just watch those fingers!
2. In a medium bowl, mix together the flour, sugar, baking powder, and salt. Gradually add the sparkling water, whisking until you have a smooth batter. It should be the consistency of pancake batter.
3. Heat the vegetable oil in a large skillet over medium-high heat. You’ll want enough oil to cover the bottom of the pan and allow the rings to float.
4. Dip each pineapple ring into the batter, let the excess drip off, and carefully place it in the hot oil. Fry for about 2-3 minutes on each side, or until golden brown and crispy.
5. Remove the rings from the oil and drain them on a paper towel-lined plate. Dust with ground cinnamon if desired for that extra warmth.

This step-by-step process is as straightforward as it gets, making it perfect for a busy evening or a spontaneous treat.