This mixture of rum and fruit juices gets its name from the forked allspice or sassafras branch used to stir it.
Pour the first 7 ingredients into an ice-filled highball glass. Stir vigorously until foamy. Garnish, if desired, and stir cocktail often while drinking.
Beach Cocktails: Favorite Surfside Sips and Bar Snacks (© 2017 Time Inc. Books)