This recipe not only gives you an excuse to make your own grapefruit shrub, but also tastes utterly amazing!

1) To make the shrub, add the sugar and vinegar to a large jar with a tight-fitting lid (like a mason jar). Peel and section the grapefruit, being careful to remove the bitter white pith. Add the grapefruit pieces to the jar, close the lid and shake vigorously. Refrigerate for 2 to 3 days. If possible, give the jar a good shake once or twice each day.

2) When the shrub is ready, pour the mixture into a blender or small food processor and blend until pureed. Pour through a fine mesh strainer into a bottle.

(Note: The shrub will last in the fridge for about a week.)

3) To make the cocktail, add the rum, shrub and cherry liqueur to a chilled cocktail glass filled with ice and stir. Top with Ruby Grapefruit White Claw Hard Seltzer. Garnish with a wedge of grapefruit, if desired.

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