6 whole mint leaves
1 ounce simple syrup
¾ ounce lime juice, freshly squeezed
1 ½ ounces aged rum
2 dashes Angostura bitters
2 ounces Champagne, chilled
Garnish: mint sprig
Muddle the mint leaves with the simple syrup and lime juice in a shaker.
Add the rum and bitters and ice, and shake until well-chilled.
Double-strain into a coupe glass.
Top with Champagne and garnish with a mint sprig.