1 lemongrass stalk, halved crosswise—bottom half smashed, top half reserved
1 2/3 ounces Cognac
2/3 ounce St-Germain elderflower liqueur
2/3 ounce fresh lemon juice
2 basil leaves, smacked
Gently rub the inside of a chilled martini glass with the smashed lemongrass and discard. Fill a cocktail shaker with ice. Add all of the remaining ingredients except the garnish and shake well. Strain into the prepared martini glass and garnish with the lemongrass top.