1984 advert for Grand Marnier
Grand Marnier is a liqueur created in 1880 by Alexandre Marnier-Lapostolle. It is made from a blend of true cognacs and distilled essence of bitter orange. Grand Marnier is 40% alcohol (80 proof). It is produced in several varieties, most of which can be consumed “neat” as a digestif and can be used in mixed drinks and desserts. In France this kind of use is the most popular especially with Crêpes Suzette and “crêpes au Grand Marnier”.
Info gleaned from Wikipedia