Verjus (pronounced vair-ZHOO) is the tart, fresh juice of unripe wine grapes. It is a culinary ingredient indigenous to the world's wine producing regions that is used in sauce making, for poaching fish and meat, and to dress lettuces, vegetables and fruit. Verjus or "verjuice" as it is sometimes called, literally means green juice in the sense that it's made from fruit that has yet to fully ripen — it's green. It is used to add acidity to foods, an important component in food and in cooking.