Dmitriy Shteynbuk — Stir or Shake? The One Rule That Decides Every Drink
The choice is not a matter of preference. It is a matter of what is in the glass.
There is exactly one rule that decides whether a cocktail is stirred or shaken, and it fits on a single line: if the drink contains citrus juice, egg, or dairy, shake it. If it doesn't, stir it.
That is the whole rule. Everything else is elaboration.
Stirring is a low-agitation technique. Its job is to chill and dilute a spirit-forward drink without introducing air or clouding the liquid. A properly stirred Manhattan is glass-clear, silky on the tongue, and cold without being frozen. Every ingredient in it — whiskey, sweet vermouth, bitters — is already miscible with alcohol. There is nothing that needs to be emulsified.
Shaking is a high-agitation technique. It exists because some ingredients — the acid in citrus juice, the protein in egg white, the fat in cream — do not mix with a spirit on their own. Ten seconds against ice in a shaker tin does what a stir cannot: it forces incompatible liquids into a temporary emulsion, aerates the drink, and produces the small ice chips and micro-bubbles that give a Daiquiri or a Whiskey Sour their signature texture.
This is why 'shaken, not stirred' is a joke on James Bond. He orders a Vesper Martini — gin, vodka, Lillet Blanc — a drink with no citrus, no egg, no dairy. It should be stirred. Shaking it clouds the drink, over-dilutes it, and produces a Martini that a serious bartender would apologize for.
Once the rule is in your hands, you never have to look up whether a drink is shaken or stirred again. Read the ingredients. If they include a juice, an egg, or dairy — shake. Otherwise — stir. That is the whole book.