To salt the margarita glasses, rub the outside rims of 4 big glasses with a cut lime and press them lightly into a plate of kosher salt, to coat.
Combine the lime juice, sugar, Grand Marnier, Triple Sec, tequila, and a big handful of ice in a cocktail shaker (or blender). Shake the margarita really well, for a good 20 seconds, and strain into the salt rimmed glasses filled with ice.
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