Remember: 2 : 3/4 : 3/4, which means 2 parts of your base spirit to 3/4 part sweet and 3/4 part sour. Typically, you can think of a “part” as an ounce, so 2 ounces spirits + 3/4 ounce sweet + 3/4 ounce sour. If you like your drinks slightly less boozy, you can simplify the ratio to 2 : 1 : 1. Always keep the correct tool for measuring ingredients in the right ratios—known as a jigger ($10, amazon.com)—close by when making cocktails. RELATED: The Surprising Secret to Making a Superior Margarita From Scratch