10 to 15 mint leaves, plus 1 sprig for garnish
2 oz white rum
1 oz fresh lime juice
1 oz simple syrup
2 oz seltzer water
Lightly muddle the mint leaves in a highball glass, then pour in the liquid, add ice, and stir. Garnish with the mint sprig, and as the author says "sip and smile".
Alternate directions: if you don't have simple syrup on hand and don't want to take the time to make it, you can muddle 1 1/2 tsp sugar with the mint leaves and add the liquid ingredients on top, stir well, then add ice. Garnish and enjoy!