Rim the glass: On a small plate, mix together the sugar and salt. Rub a lemon wedge around the top edge of your glass to moisten it, then dip the glass into the sugar-salt mixture so that it sticks, tapping all the way around.
For one (or two) drinks: Fill a small cocktail shaker with ice. Add the tequila, amaretto, lemon juice, and lime juice. Tightly close and shake vigorously for at least 30 seconds (it's longer than you think). Strain into the rimmed glass. Enjoy immediately.
For a pitcher: In the bottom of a pitcher, stir together the tequila, amaretto, lemon juice, and lime juice (do not add ice to the pitcher). Serve immediately or place a piece of plastic wrap over the top of the pitcher and refrigerate for up to 4 hours. Shake just before serving.
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