Fill a Collins glass with ice.
Pour 45ml vodka over the ice.
Top with 90ml fresh-squeezed grapefruit juice.
Stir gently to combine.
Garnish with a grapefruit wedge or wheel, if desired.
The Greyhound becomes a Salty Dog with the simple addition of a salted rim - a small tweak that rounds out the grapefruit's bitterness and adds a savory dimension worth trying. Always use fresh-squeezed grapefruit juice; bottled juice lacks the aromatic oils and brightness that make this drink sing.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Greyhound.