Gush Etzion Winery - Sour Cherry Liqueur (2006) (Liqueur) Status: Certified - Kosher for Passover (when bearing the OU-P logo) Liqueurs are, by definition, flavored drinks and require certification. Sometimes a liqueur is referred to as an aperitif or cordial. Some examples of liqueurs are the beverages known as Alexander, Amaretto, Arak, Curacao, Eggnog, Goldwasser, Grasshopper, and Sloe Gin.