Halve key limes then squeeze juice into cocktail shaker. Toss juiced limes in shaker then add mint and sugar. Using a wooden spoon, muddle ingredients in shaker.
Add ice, rum, cranberry juice and sparkling water. Shake mixture then strain into glasses of fresh ice.
Garnish with lime wedge and fresh mint!
Notes
If you want a cocktail that’s a little more tart, opt for organic pure cranberry juice instead of cranberry juice cocktail!