Cointreau is a brand of triple sec liqueur produced in France. It is an orange-flavored liqueur that is often used in cocktails such as margaritas or Long Island Iced Tea. While Cointreau is orang-flavoured and its bottle is orange, the liqueur itself is actually colorless.
Cointreau was first produced midway through the 1800s and its name derives from the last name of the Cointreau brothers. The method of production and recipe of Cointreau are kept secret to this day to avoid it being copied.
The correct pronunciation of Cointreau in French is Cwehn-troh.
The first syllable of Cointreau, -coin, is pronounced as -cwehn, where the final "n" is a nasal "n" that seems like it is not fully pronounced. In addition, the "eh" sound in -cwehn sounds like it is pronounced midway between an "eh" and "oh" sound.
The second syllable, -treau, is pronounced with a slightly gargled "r" that is typical of French. Given that it can be difficult to pronounce for English speakers, it may be best to try to pronounce a softer "r". The end of the syllable, -eau, transcribed as -oh, resembles the sound of the letter "o", but sounds as if you were to stop pronouncing the letter midway through it, pronouncing it with less stress. It is also important to avoid making the mistake made by many English speakers of pronouncing -eau as "ow".