
Grapefruit juice is the tart, faintly bitter liquid pressed from the grapefruit (Citrus paradisi), a hybrid citrus fruit.
Rounded and juicy on the palate, finishing on a distinct bitter edge; tart and moderately sweet, with a fragrant citrus aroma, the bitterness sharper in white varieties and softer in pink and red.
Bartenders shake it into the build as a souring and lengthening juice, where its bitter-aromatic character balances sweeter components; dosed generously as a featured juice or in a small accenting squeeze. Bottled versions are often sweetened or blended, shifting the sweetness–acidity balance from fresh-pressed.
Pink or red grapefruit juice, which delivers essentially the same tart-bitter profile and aroma with a softer, sweeter edge and rosier hue; if only sourness is needed as a small accent, another citrus acid can stand in, with sugar or syrup to match sweetness.
Pomelo juice
Grapefruit is a hybrid of pomelo and sweet orange; pomelo is one of its parent species, larger with thicker pith, and its juice is generally milder, less acidic and less bitter.
The juice is pressed or extracted from grapefruit, a hybrid of the sweet orange and the pomelo. Flesh colour varies by variety from white and yellow to pink and red, the redder pigment linked to lycopene and beta-carotene, while the characteristic bitterness comes largely from the flavonoid naringin. It is acidic, with a pH typically around 3.
Fresh juice oxidises and loses aroma quickly, and its bitterness can build over time, so it is best pressed and used fresh.
The grapefruit originated in Barbados in the West Indies in the 18th century as an accidental hybrid.