Fill a highball or other tall glass halfway with crushed or cubed ice.
Add the fresh mint leaves to your cocktail shaker. Use a muddler or the back of a spoon to press down three or four times gently muddle the mint until you can smell the mint. Do not over-muddle or it will taste bitter.
10 mint leaves
Add the rum, blue curaçao, lime juice, and syrup to your shaker with an ice cube or two, then double strain into your highball glass.
2 ounces white or silver rum, 1 ounce blue curaçao, ¾ ounce lime juice, ½ ounce simple syrup or light agave
Fill the glass the remainder of the way with ice, then pour your soda water over top.
club soda or soda water
Slap a mint sprig on the table to release the oils, then add it and a lime wheel for garnish.
lime wheel