Fifth feliz de mayo! Original Margarita The Cointreau-tequila-lime juice Margarita has been named Cointreau's official drink of Cinco de Mayo. According to Cointreau, this is the original recipe as created by Margarita Sames, a Texas socialite, in 1948. 1part Cointreau liqueur 2parts tequila Fresh lime juice Ice Mix Cointreau, tequila and lime juice with ice. Stir, strain into a Margarita glass and serve