Whiskey River Cocktail

Step 1

Combine sugar, cardamom, and 1/2 cup water in a small saucepan. Bring to a simmer, remove from heat, and whisk until sugar is dissolved. Cool completely; discard cardamom.

Step 2

Combine bourbon, lemon juice, grapefruit juice, bitters, 1 ounce cardamom syrup, and ice in a cocktail shaker. Shake until very cold, about 20 seconds. Serve over ice topped with a splash of club soda.