What is elderflower liqueur?

Elderflower liqueur is a sweet, floral-tasting liqueur made from the flowers of the elderberry tree. Elderflowers have a delicate, sweet fragrance and muscatel flavor that are very popular in many European countries. Elderflower liqueur is often used as an aperitif or digestif, and can also be used in cocktails. It can be made at home or purchased commercially, and is typically clear in color.