Simple syrup can be made or bought and used to sweeten your margarita.
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Using fresh lime juice is key to a good margarita. The shelf-stable bottled kind will not produce a quality cocktail.
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Zest some lime into your coarse salt and use your fingers to mesh it together. Use a lime to wet the rim of your glass and then dip it into the salt mix.
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Add all your ingredients to your shaker. If you don't have a cocktail shaker, use a mason jar. Just remember, it's glass, so shake carefully!