The Salty Dog cocktail is good for two reasons. One, you get to pick your poison, gin or vodka. But gin far better complements the tartness of the grapefruit and the briny salt brim, at least in our opinion. Two, it's a flexible drink when it comes to portion control—we recommend a 1:1 ratio grapefruit juice to booze, but you might like it with less of a wallop. For a full glass of the stuff, up the ratio to 2:1. See? Perfect for anyone who likes choices.