Dilution and temperature

Stirring a spirit-forward drink to proper temperature adds roughly 20-30% of its final volume as water. Shaking adds more — around 25-35% — because crushed edges and violent agitation melt ice faster. Blending goes further still, since the ice becomes the drink.

That water is not a loss. It softens alcohol's burn, opens up aromas that are suppressed at full strength, and brings the drink to a volume you can actually drink. A Manhattan stirred for five seconds is not a stronger Manhattan; it is an unfinished one.

This is also why batching for a party requires adding water deliberately: a pre-mixed bottle poured over ice gets far less dilution than a drink stirred to order, so the water has to go in when you make the batch.

Temperature changes perception directly. Cold suppresses sweetness, so a drink balanced at room temperature tastes cloying once chilled, and one balanced warm tastes thin once iced. Cold also mutes aroma, which is why a very cold drink tastes cleaner and simpler than the same drink at room temperature — sometimes an improvement, sometimes a loss.

It matters practically too: a chilled glass buys several minutes of the drink staying where you put it, and a warm glass undoes a good shake immediately.

Serve spirit-forward drinks properly cold and short. Serve long drinks over a full glass of ice. The one thing to avoid is a half-filled glass of ice in a warm room, which dilutes fastest and stays coldest for the shortest time — the worst of both.

Ice size is the main lever. More surface area means faster chilling and faster dilution; a single large cube in an Old Fashioned melts slowly enough to keep the drink close to full strength for twenty minutes, while the same volume as small cubes would water it down in five.

Ice temperature matters more than people expect. Ice straight from a freezer is well below zero and chills with relatively little melting; ice that has been sitting in a bucket is already at melting point and dilutes immediately on contact.

Shake or stir until the outside of the tin or glass is properly frosted — that is the signal, not a stopwatch. Twelve to fifteen seconds of hard shaking and around thirty seconds of stirring are reasonable starting points, but the frost is what you are actually waiting for.