
Grapefruit juice is the tart, faintly bitter juice pressed from grapefruit.
White grapefruit sours and bitters at once. Anything you reach for covers the sourness easily and the bitterness rarely, and that is the half the drink is built on.
Pink grapefruit juice
Sweeter, milder and less bitter; recipes written for white grapefruit come out soft with it, so cut the sugar to compensate.
Grapefruit soda
Sweetened and carbonated, with a fraction of the fruit; it lengthens a drink; the juice sours one.
Fresh juice keeps a day refrigerated and turns more bitter as it stands rather than losing flavor. Whole fruit keeps two or three weeks chilled, and a heavy fruit for its size has more juice in it.