Pour in the vodka, grapefruit juice and simple syrup
Stir vigorously for 30 seconds
Strain into a cocktail glass
Add a wedge of fresh grapefruit for garnish, if desired
Notes
Variations:
Salty Dog Cocktail -- The same recipe, just add some salt to the rim of the glass.
Italian Greyhound Cocktail -- Keep the vodka and the grapefruit juice, just add 1 ounce of Campari.
Rosemary Greyhound Cocktail -- The same drink, just add a sprig of Rosemary as a garnish. Or, you can try to make a homemade rosemary-infused simple syrup.
Sparkling Greyhound -- Add a splash of club soda or ginger ale for a sparkling version of this grapefruit cocktail.