More to the point – this is a vodka greyhound… Like many cocktails that we enjoy today with vodka as their base spirit; they would have been originally made with something else. In this case the greyhound was originally made with gin. You can make it either way – in fact you should try both and see which you like better.
If the grapefruit juice is to sour for you, feel free to add some sugar.
1½ oz Vodka
Fill the collins glass with ice.
Add the vodka, and top off with grapefruit juice.
Stir and serve.