Dry shake vs wet shake

Foam is air trapped in a liquid by something that will hold it there. In a whiskey sour that something is egg white protein; in an espresso martini it is the oils and fine solids in fresh espresso; in a vegan sour it is the protein and starch in aquafaba. In every case the stabiliser has to unfold and spread around the air bubbles, and that happens far more readily in a warm, low-viscosity liquid than in a cold, thick one.

That is the whole argument for shaking without ice first. With ice in the tin, the liquid is at near-freezing within a few seconds and it thickens; the protein stiffens before it has had a chance to spread, and you end up with a few big bubbles rather than a dense microfoam. Without ice, fifteen seconds of hard shaking gives you a visibly thickened, pale, aerated liquid before any chilling happens.

The wet shake then does the two jobs the dry shake cannot: it takes the drink down to serving temperature and it adds the meltwater the recipe assumes. Both are non-negotiable - a sour served without that dilution is harsh, and a warm sour is unpleasant no matter how good the head is. How to shake a cocktail covers the motion for both.

Pressure is the practical reason to be careful with a dry shake. A dry tin seals with warm air inside and the liquid is not holding the seal down, so a sloppy seat pops more easily than it does with ice. Seat the tins firmly, and shake with a hand over the join for the first couple of seconds.

The single most common error is the one in the last row of the dry-shake column: filling the tin too full. Foam needs somewhere to go, and a 28 oz tin containing 4 oz of liquid whips far better than an 18 oz tin containing the same, because the air space is doing the work. If your foam is disappointing and your technique is right, try the bigger tin.

The standard order is dry then wet. Combine everything including the egg white in the small tin, seal, dry shake hard for about fifteen seconds, open, add a full charge of ice, seal again and wet shake for another ten to fifteen. Double strain into the glass through a fine mesh. This is the reliable method for a whiskey sour or a pisco sour and it is the one to learn first.

The reverse dry shake inverts it. Wet shake first with ice, strain the chilled liquid off the ice into the clean tin, then dry shake that liquid and pour. The theory is that you are whipping an already-diluted liquid with no ice shards in it, which gives a denser, smoother and longer-lasting head - and it is now the common approach for espresso martinis, where the crema is most of the presentation. Best cocktail shaker for espresso martini covers the tins for exactly that drink.

1. Chill the glass first - a coupe or a Nick & Nora, in the freezer or filled with ice water while you work.
2. Build the drink in the small tin: spirit, citrus, syrup, and the egg white or espresso last.
3. Dry shake hard for about 15 seconds, with a hand over the join for the first couple of seconds.
4. Open, add a full charge of large cubes, reseal and wet shake 10 to 15 seconds until the tin is painfully cold.
5. Strain through a Hawthorne and then through fine mesh into the chilled glass.
6. Let it settle for twenty or thirty seconds before garnishing - the head firms up as it stands.

Step five is where most home sours lose their texture. A single strain brings ice shards through, and ice shards in a foam melt and collapse it from underneath. When to double strain a cocktail explains which drinks need it and how to use a Hawthorne strainer covers the first strain.

A thin head almost always means the dry shake was too short, too gentle, or had too little air space. Fifteen seconds of genuinely hard shaking is longer and more violent than people expect, and the liquid should look visibly paler and thicker when you open the tin. If it does not, keep going.

No head at all usually means the egg white was old or the citrus went in on top of it and started to set it before the shake. Fresh egg white foams better, and in practice a fresher egg separates more cleanly too. Aquafaba - the liquid from a can of chickpeas - is a genuine substitute and behaves similarly, though it needs a slightly longer dry shake.

A drink that tastes of egg is a sign of not enough citrus or not enough aromatic garnish rather than a technique failure. The acid in the citrus is what neutralises the smell, and a few drops of bitters or a grating of nutmeg on the head is the traditional fix - the aroma sits right under your nose as you drink.

And if the head is perfect but the drink is harsh, the wet shake was too short. Cold and diluted are two different achievements, and a ten-second wet shake with big cubes delivers less dilution than the same shake with smaller ones. What size ice for a cocktail shaker covers that trade, and best cocktail shakers covers the tins themselves.