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"The Tequila Maketh the Margarita"

Use good Tequila, preferably 100% Blue Agave, if you can get hold of it. You can substitute Cointreau for the Triple Sec (or Curacao or another Orange Liqueur if you must).

I've always had frozen Margaritas (ie, blended with crushed ice), but in Arizona they're pretty serious about their Margaritas and purists tell me it should be served on the rocks. In a HUGE glass. Needless to say, I drank far too much in Arizona...