Earthy and dark, Root Beer Bitters are complex and complement barrel-aged spirits. Citrus and herbal notes balance robust spices like anise and cinnamon. Select Ingredients: Sarsaparilla, Birch, Anise, Dandelion, Vanilla, Ceylon, Wintergreen Application: Rum Old Fashioned, Tiki Cocktails, Hard Cider, Cookies Ingredient Fact: In addition to Sassafras, the ingredients Sarsaparilla, Birch and Star Anise are also prevalent in historical formulas for root beer.