1 grapefruit slice and 1 preserved cherry, for garnish
In a cocktail shaker, combine the grapefruit juice, bourbon, simple syrup and basil. Fill a chilled rocks glass with ice. Add 5 ice cubes to the shaker and shake well. Strain the drink into the ice-filled rocks glass. Garnish with the grapefruit slice and cherry.
Make simple syrup by boiling equal parts sugar and water. Let cool before using.