Now I'm almost 70 years and have never heard of "verjuice". When searching for the "mustard production" I found out on the Internet. Not only for mustard, but also for all drinks, meals and sauces, which are to be sour, this wonderful natural product is highly recommended. It causes an absolutely fine, unobtrusive acidity, which does not destroy the delicate flavors of pickles, sauces and vegetables, but delicately underscores. But even the manufacturers kudos. This fine wines is "befitting" packaged in a glass bottle and placed perfectly packaged for shipping.