Despite dating back only to the 1930's or 40's, the origin of the Margarita is as fuzzy as the drink can make you. The Wikipedia Margarita page lists 6 different possible accounts for the creator of the Margarita. With no way of verifying which story is true, I'm just glad someone created the drink.
Using the Citrus Juicer, prepare the Lime Juice first. Once you have your lime juice, half fill the Cocktail Shaker with Ice and pour in the Tequila, Triple Sec and the lime juice and shake until the shaker becomes cold to the touch.
Strain the mixture into the Chilled Cocktail Glass, garnish with the twist of lime and serve.
Optional changes to the above recipe include: Salted, Frozen, "On the Rocks" and Fruit variations: including the Strawberry Margarita.
By varying the basic ingredients you can also change the flavours of the drink. For instance using Cointreau instead of Triple Sec will give a stronger matured flavour. This is even more noticeable if you replace the triple sec with Grand Marnier. When replacing the triple sec with Cointreau or Grand Marnier it is common place to replace the Tequila with higher quality brands, thereby creating a premium margarita.