Why do you stir a Manhattan instead of shake it?

Stirring chills the cocktail slowly without aerating it, producing the clear, silky texture expected of a spirit-forward drink. Shaking would cloud the Manhattan with ice shards and aeration, ruining the visual and the mouthfeel.

The Manhattan contains only clear spirits and modifiers — rye whiskey, sweet vermouth, bitters. Drinks of this type are stirred because: (1) Aesthetics: stirring produces a glossy, transparent cocktail with the deep amber color visible. Shaking introduces tiny air bubbles and broken ice shards, making the drink cloudy and translucent — wrong for a Manhattan. (2) Mouthfeel: a stirred drink feels silky and viscous on the palate, with the alcohol carried smoothly. A shaken version feels lighter, almost watery, with the texture broken up by the aeration. (3) Dilution control: stirring dilutes more slowly and predictably than shaking. A 25-second stir over good ice adds just enough water to soften the whiskey's bite without diluting it out. A shake adds the same dilution in 8 seconds, often overshooting. The rule for cocktails: shake if it has citrus, dairy, egg, or fruit; stir if it's spirit-only. Manhattan, Martini, Negroni, Old Fashioned, Boulevardier, Sazerac, Vieux Carré — all stirred.