Cointreau is an orange-flavored triple sec liqueur first created by Édouard Cointreau in 1885. It is produced in Saint-Barthélemy-d'Anjou, France, by the Cointreau family, using orange peels.
Cointreau is still a full 80 proof, so plenty bracing in comparison to some less boozy offerings out there — and still not at all cheap in comparison. It remains as classy and as versatile as ever.