In a glass, add mint leaves, lime wedges, and sugar.
Gently muddle (press) them using a muddler or spoon to release lime juice and mint oils.
Fill the glass with ice cubes.
Add 60 ml of white rum (skip for mocktail).
Stir everything well to combine.
Pour soda water to fill the glass.
Garnish with a mint sprig and a lime slice. Serve immediately.