Fee Brothers Rhubarb is a product of Fee Brothers company, established in 1863 in New York. Fee Brothers survived prohibition by using glycerin as an alternative to alcohol. Fee Brothers Rhubarb is a modern cocktail bitters that is both sweet and sour. Use this one to accentuate fruit flavors in sour or citrus cocktails, such as a Pisco Sour. Also pairs well with cranberry, raspberry and strawberry juices and is superb in a Gin & Tonic.