Grand Marnier is a French brand of liqueurs. The brand's best-known product is Grand Marnier Cordon Rouge, an orange-flavored liqueur created in 1880 by Alexandre Marnier-Lapostolle. It is made from a blend of Cognac brandy, distilled essence of bitter orange, and sugar. Grand Marnier Cordon Rouge is 40% alcohol (70 proof in UK, 80 proof in US).

Grand Marnier's first distillery was built in 1827 by Jean Baptiste Lapostolle in the small city of Neauphle-le-Château. His granddaughter Julia married Louis-Alexandre Marnier in 1876 and, four years later, the Marniers released a signature cognac with Caribbean bitter orange.

The hotelier César Ritz (1850–1918) reportedly came up with the name Grand Marnier for Marnier-Lapostolle, who in return helped him purchase and establish the Hotel Ritz in Paris. During the extravagant Belle Époque, Grand Marnier was served in the Ritz Hotel as well as the Savoy Hotel. The brand has released anniversary editions of its well-known liqueur lines and became popular in the United States in the 1980s.

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