
Green grapes are ordinary white table grapes — sweet, juicy and mild, with thin skins and very little tannin.
Muddled, they give fresh grape sweetness and a light acidity, and sit well with gin, vodka, pisco and white wine. Press gently: hard muddling shreds the skins, and even their little tannin dries the finish.
Red or black grapes
Work one for one but tint a pale drink pink when muddled.
White grape juice
Works at about 30 ml per 10 grapes. It is about as sweet, but the drink loses the crushed-fruit texture.
Concord-type grapes
Will not work. Their candy-like aroma takes over.
A week or two in the fridge, rinsed just before use. They fail from the stem end first, so check where the berry meets the stalk, not the far side.