
Lemon is a yellow citrus fruit prized in the bar for its acidic juice and aromatic oil-rich peel.
The aroma is sharp and clean, lifting from the oily peel; the flesh follows with a keen, mouth-puckering sourness and only faint sweetness.
Bartenders halve and squeeze it for fresh souring juice added to the shake, cut it into wedges or wheels for garnish, and pare strips of peel to express aromatic oils over the surface. It is dosed to acidity rather than by fixed measure.
Another sour citrus such as lime, though it shifts the aromatic profile.
A whole lemon is the fruit of the citrus tree, with a bright yellow rind holding fragrant oils over a pale, segmented, tart flesh. It is used fresh in three parts: the juice, the peel, and occasionally the whole slice.
Whole fruit keeps for a week or two refrigerated; once cut or juiced, aroma and acidity fade within a day or two.