A Greyhound is one of the great, underappreciated two-ingredient drinks, and this frozen take on the drink pays homage to the delicious grapefruit drink. In place of the usual vodka, though, we use gin at the base for this riff—it was, after all, the spirit used in the original recipe from Harry Craddock. A splash of simple syrup makes sure all of the sweet-tart grapefruit flavors still pop, even after being diluted with a couple cups of ice. And a sprinkling of grapefruit zest on top of the finished drink will bring out those tangy notes even more, especially as you lift the drink to your lips.
When it comes to the question of which gin to use, the choice is up to you. If you want to really taste the spirit’s signature juniper flavor, opt for a textbook London Dry gin like Tanqueray or Beefeater. If, on the other hand, you’d prefer to favor the fruity grapefruit flavors, opt for a softer gin like Nolet’s or Plymouth.