Muddle the mint: In the bottom of a sturdy glass or shaker, add mint leaves and lime juice.
Gently muddle 3–4 times to release the oils without shredding the leaves.
Blend or mash the pineapple: If using fresh pineapple, pulse in a blender until smooth. If you prefer a pulp-free drink, strain the purée. Using juice?
Skip this step.
Combine the base: Add pineapple (purée or juice), coconut water, and optional honey/agave to the muddled mint and lime. Stir well to dissolve sweetener.
Add ice: Fill your serving glass halfway with ice. If you like it extra cold and frosty, use crushed ice.
Top with bubbles: Pour in sparkling water.
Give it a gentle stir to keep the fizz.
Finish and garnish: Add a pinch of sea salt if using, tuck in a mint sprig, and garnish with a lime wheel or pineapple wedge. Serve immediately.