Total time: 5 minutes
Note: Adapted from Alex Straus, Hemingway's Bar. To make vanilla simple syrup, place 1 cup sugar, 1 cup water and 1 vanilla bean, split and scraped, into a small pot; boil until the sugar is dissolved. Strain and cool before using. This makes 1 cup; it will keep, covered and refrigerated, for up to 2 weeks.
1 1/2 ounces dark rum (Straus uses Atlantico)
3/4 ounce vanilla simple syrup (or vanilla liqueur such as Licor 43)
1 ounce crème fraîche
3 dashes bitters (Straus uses Bittermens Tiki Bitters)
Freshly grated nutmeg for garnish
In a cocktail shaker with ice, combine the rum, vanilla simple syrup, crème fraîche and bitters. Shake vigorously and strain into a chilled cocktail glass. Garnish with freshly grated nutmeg.