2 oz. silver tequila
1 oz. Cointreau
1 oz. lime juice
coarse salt
Chill a cocktail glass, and then rub its rim with lime juice and dip it in coarse salt.
Add tequila, Cointreau, lime juice, and ice together in a cocktail shaker.
Shake and then strain into the glass over ice.
For a slighter sweeter version, add agave syrup before shaking. And of course, if you prefer them frozen (though that's not the traditional way to make a margarita), simply add the ingredients to a blender and then blend until smooth.