The Frozen Margarita has many a story about its origins. While the history is a little icy, one thing that’s history is solid is when the Frozen Margarita machine was invented, which was May 11, 1971, by restaurant owner Mariano Martinez. Basically a converted soft-serve ice cream machine, the original machine is on display at the Smithsonian National Museum of History. Some other facts include: the Margarita was the "Drink of the Month" in Esquire magazine in December of 1953, and further popularized by the Jimmy Buffett song "Margaritaville".
Fill a blender with crushed ice. Add all ingredients. Blend and pour into a chilled cocktail glass. Garnish with lime.