In a medium saucepan over medium heat, combine 1/4 cup granulated sugar and 1/4 cup water, stirring until the sugar has dissolved.
2
Add 1/2 cup blueberries and the zest of 1 lemon. Bring the mixture to a boil.
3
Reduce heat and simmer the mixture until the blueberries burst, about 5 minutes.
4
Remove from heat and let cool for 10 minutes, then strain the mixture into a clean jar.
5
Allow the blueberry syrup to cool completely.
6
On a small plate, mix together 2 tablespoons granulated sugar and 2 tablespoons kosher salt.
7
Rim each glass with a lemon wedge, then dip the rim in the sugar-salt mixture. Divide 8 ounces of tequila, 4 ounces of triple sec, and 1 cup of lemonade between 4 glasses.
8
Fill each glass with ice, then top with the blueberry syrup. Garnish with a lemon wedge to serve.