Shaking and stirring are not interchangeable. Each method changes dilution, texture and temperature in a different way, and choosing the wrong one is the fastest way to ruin a good recipe.
Shake for texture
Use a firm, hard shake when citrus, syrup, cream or egg white needs to be fully integrated. The movement adds aeration and gives the drink a lively, frothy finish. Ten to twelve seconds is enough for most drinks — longer just adds water.
Stir for clarity
Stir spirit-forward cocktails — Manhattans, Negronis, Martinis — gently with plenty of ice until they are cold and silky. The goal is controlled dilution without introducing bubbles, so the drink stays clear and heavy on the palate.
The simple rule
If the recipe contains juice, dairy or egg, shake it. If it is all spirits, liqueurs and bitters, stir it. Learn the rule first; break it only when you know exactly why.