Grand Marnier is an orange-flavored cognac-based liqueur. It is made with a blend of Cognac brandy and distilled essence of bitter orange that is produced in a slow-aging process using a variety of pot stills over a period of more than 10 years. This gives the liqueur its distinctive orange flavor and aroma. It should be served chilled or at room temperature as an after dinner drink, in cocktails, or as an ingredient in desserts.