Muddling means using a muddler — a blunt pestle-like tool — to press ingredients in the bottom of a shaker or glass to release their flavor. For citrus, you're extracting juice. For herbs like mint, you're bruising the leaves gently to release their essential oils without tearing them. The key word is gently: over-muddling mint produces bitter, chlorophyll-heavy flavor; under-muddling fruit wastes the juice. Technique matters here more than force.
Why It Matters
Some ingredients can't be incorporated any other way. You can't shake a whole lime wedge into a drink without muddling it first. And fresh mint releases almost no aroma without bruising — the volatile oils that make a Mojito smell like a Mojito are locked in the leaf until you break the surface.
Where You'll Use It
Mojitos (mint and lime), Caipirinhas (lime), Old Fashioneds with a sugar cube, Smashes (herb or fruit). Any recipe that calls for fresh fruit wedges or herbs in the shaker.