You’ve probably heard the term ‘a sour’ before when someone was referring to a drink. For example a whiskey sour. But it’s certainly not the only one in the family. A sour is actually a combination of a spirit / liquor, acidity and a sweetener. The acidity can be lemon or lime while the sweetener can be a syrup. The most important thing when creating a sour is finding that perfect balance between sweet and sour.