What are Liqueurs? Liqueur is a solution composed of alcohol, sugar and water, prepared hot or cold, flavored with extracts of vegetable origin. The liqueurs are divided into the following classes based on the preparation technique. Infusions: these are macerated aromatic herbal substances that release their principles in alcohol. Distillates: they are prepared by distillation of the alcoholic macerate, if they get clear spirits. Prepared with essences: concentrated essential oil is solubilized in alcohol.