Sour cocktails like the Whiskey Sour, the Sidecar, and the Daiquiri are among the most well-known and totally-drinkable drinks – total crowd-pleasers. The classic sour recipe is easy to riff on: 2 parts base spirit, ¾ part sour, ¾ part sweet. You'll see those proportions repeat often in this category of drinks, along with plenty of variations on the theme.