Vermouth is a liquor made from wine, with different herbs and spices added for flavor. It is also known as an aromatized liquor, and some people refer to it as a fortified wine. Vermouth tends to have more flavor than most wines, so you may need to use less of it than you would if you were cooking with wine. And the bonus is that it has a long shelf life. I would encourage you to store the Vermouth in your refrigerator once opened though. It will last longer (up to 3 months) and stay fresher. I used Martini & Rossi Extra Dry Vermouth for my soup. Their Vermouth is made with a “secret” blend of rare woods, herbs and spices that was first introduced in 1900.