El Definitivo

My version of the recipe at La Bodeguito del Medio in Havana:

½ lime
6 fresh mint leaves
1 sloppy tablespoon of simple syrup
2 oz. rum
club soda

Ream lime half fully, extracting all juice into a tall cocktail glass, and drop reamed half into glass. Add mint leaves and syrup, and crush mint leaves thoroughly with a muller (you cannot overdo this unless you break the glass; extract as much essence as possible). Add rum. Fill glass with crushed ice and then fill with soda. Mix with a long spoon, and garnish with extra mint.

¡Lo mejor!