3 fluid ounces fresh lemon juice
2 teaspoons white sugar, or as needed
2 fluid ounces vodka
1 fluid ounce triple sec
Pour 1/4 to 1/2 inch of sugar onto a small, shallow plate. Moisten the rim of a margarita glass with a wedge of lemon, dip the moistened glass into the sugar; set aside.
Pour the lemon juice, 2 teaspoons of sugar, vodka, and triple sec into a cocktail shaker over ice. Cover, and shake until the outside of the shaker has frosted. Strain into the prepared margarita glass, and serve.