Ingredients

• 1/2 lime, cut into 3/4-inch pieces
• 2 teaspoons light brown sugar
• 1/8 white grapefruit
• 1 kumquat, halved
• 2 ounces aged white rum

Instructions

1. Muddle lime and brown sugar in a cocktail shaker. Add grapefruit and kumquat and muddle until lightly crushed and juices are released. Fill cocktail shaker with ice, add rum, and shake vigorously until very cold, about 20 seconds. Pour into an old-fashioned glass or tumbler and serve with two straws.