How to muddle a cocktail: mint, lime, sugar and fruit

Muddling presses an ingredient against the bottom of the glass or shaker so it gives up what you want and keeps back what you do not. Mint keeps its scent in oil glands on the surface of the leaf; tear the leaf apart and it adds a grassy bitterness. A lime’s juice and the oil in its peel are wanted, and the white pith between them is bitter. A sugar cube has to be crushed until it dissolves.

So the pressure depends on the ingredient. The table gives each one with the Field Manual drinks that use it, and the cocktail terms glossary defines muddle in a line.

Mint is the herb most often over-muddled. The Mojito, the Mint Julep and the Jerry Can Julep all press it once or twice and no more.

1. Strip the leaves from the stems and drop them into the glass or tin. The stems add bitterness and nothing else.
2. Add the sugar or syrup on top. The sugar breaks the leaf surface gently, and the liquid catches the oil as it is released.
3. Hold the muddler upright, flat end down, with your palm over the top.
4. Press straight down, firmly enough to bruise the leaves against the glass, and lift. Do it once or twice. Do not twist or grind.
5. Stop when the mint smells strongly and the leaves are darkened but whole. Then add the ice and the rest of the drink.

If the drink needs more mint, add a slapped mint sprig at the rim rather than pressing harder. A sprig adds scent without bitterness, and garnishing like a pro shows how to set it.

Citrus needs more force than leaves to give up its juice. The Caipirinha is the drink that teaches it.

1. Cut a lime into eight pieces and put them in a rocks glass.
2. Add four teaspoons of caster sugar directly onto the lime.
3. Muddle firmly for 20 to 30 seconds, until the lime has released its juice and the sugar has begun to dissolve.
4. Fill the glass with crushed ice, pour in 60ml of cachaça and stir briefly.

The sugar scours the peel and draws its oil into the juice. Press the pieces rather than grinding them: the juice and oil come out under steady pressure, and the bitter pith only when the peel is shredded. Cutting the white core out of each piece first makes the drink less bitter still.

Lemon wedges work the same way. The Whiskey Smash muddles three lemon wedges firmly with the syrup, then adds the mint and presses it gently.

The Old Fashioned starts with a sugar cube soaked in two dashes of Angostura bitters, muddled in the glass until it has fully dissolved. A few drops of water help. Undissolved grains sit at the bottom, and the drink starts sharp and finishes sweet.

The Field Manual’s Old Fashioned muddles no fruit. Pressing an orange slice and a cherry into the glass is an old bar habit that makes a sweeter, cloudier drink; the orange belongs in the peel, expressed over the top. The Old Standard skips the cube and stirs demerara syrup with the bitters, which needs no muddling at all.

Soft berries give up their juice and colour with little force. Press until they burst and stop, because crushed blackberry and raspberry seeds make a drink gritty. The Black Widow muddles three blackberries in the shaker, then shakes the drink and double strains it through a fine mesh strainer into a chilled coupe.

Strawberries are firmer: hull and quarter them, then press until the juice runs. Blueberries need real pressure to split their skins. Thaw frozen fruit first, or it chills the drink and gives up little juice.

Rosemary and thyme have woody stems that do not break down. Slap a sprig and use it as a garnish, or steep the herb in hot simple syrup and strain it. Pineapple is fibrous and mango slippery, and both are better juiced or blended. Passion fruit needs no muddling: halve it and scoop the pulp in.

A muddler is a short, thick rod for pressing in the bottom of a glass or tin, usually 20 to 25cm long. Choose one long enough to reach the bottom of your shaker. A flat end presses evenly. A toothed end crushes sugar well but shreds mint. Unvarnished hardwood and stainless steel both last; varnish wears off into drinks in time.

Muddle in a heavy rocks glass or a metal shaker tin, never in a thin glass, which can crack. With no muddler, the flat end of a rolling pin or the back of a bar spoon will do for mint. The Jerry Can Julep presses its mint with either.

Bitterness from torn leaves or pith cannot be taken back out. Extra syrup or more ice hides it a little, but the honest fix is to make the drink again and press less. An under-muddled drink is easy to rescue: press the mint once more, or add a slapped sprig at the rim.

For a crowd, muddle each drink as it is made, or make a mint syrup ahead. How to batch cocktails covers what can be prepared the day before, and how to make cocktails at home sets muddling beside the other core techniques.