Muddle Magic: In a sturdy glass or cocktail shaker, muddle the watermelon cubes, mint leaves, jalapeño slices, and sugar until juicy and fragrant.
Add the Zing: Pour in the fresh lime juice and rum. Give it a good shake (or stir if you’re mixing in the glass).
Build the Mojito: Fill tall glasses with ice. Strain the muddled mixture over the ice for a smooth sip, or pour it all in for a rustic vibe.
Top and Garnish: Top with sparkling water. Garnish with mint sprigs, extra watermelon cubes, or a thin slice of jalapeño for flair.
Sip & Enjoy: Stir gently and serve immediately for a burst of sweet, spicy, and minty freshness!