Long a staple of French cooking, Verjus is an acidic, sour liquid that is made from unripe green grapes. Due to its mild acidity, it is an extremely versatile ingredient that will enhance poultry, game, fish, seafood, stews, marinades, sauces and even salads. Use it as a marinade. It is also used to heighten flavor in the same manner that lemon or vinegar would be used. Less acidic than vinegar, it is perfect for salad dressings and as a pan deglazer. Verjus is produced in the manner of fine wine, yet because of the low acidity level it will not distort the characteristics of a good table wine being enjoyed with the meal.