Verjuice (from French jus vert "green juice") is a very acidic juice made by pressing unripe grapes. Sometimes lemon or sorrel juice, herbs or spices are added to change the flavour. In the Middle Ages, it was widely used all over Western Europe as an ingredient in sauces, as a condiment, or to deglaze preparations.

It was once used in many contexts where modern cooks would use either wine or some variety of vinegar, but has become much less widely used as wines and variously flavoured vinegars are more accessible nowadays. Nonetheless, it is still used in a number of French dishes as well as recipes from other European and Middle Eastern cuisines, and can be purchased at some gourmet grocery stores.

Modern cooks most often use verjuice in salad dressings as the acidic ingredient, when wine is going to be served with the salad. This is because verjuice provides a comparable sour taste component, yet without "competing with" (altering the taste of) the wine the way vinegar or lemon juice would.

Other uses of the word verjus
The authors of The Medieval Kitchen: Recipes from France and Italy write that the grape seeds preserved in salts were also called verjus during the Middle Ages. In the regional French of Ardèche, a cider fermented from crab apple juice is called verjus.

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)