Directions

1. Put the blackberries, 1/2 cup sugar, and juice of 1 lime in a saucepan. Bring it to a boil, stirring constantly, then reduce the heat and simmer for 20 to 25 minutes until thick. Strain through a fine mesh strainer, pressing to get all the liquid out, then place the liquid in the fridge and chill until cold.
2. To make the lime sugar, zest the 3 limes and lay out on a paper towel to dry for 30 minutes. Add the zest to 1 cup of sugar and mix together. Rub a lime wedge around the rims of margarita glasses and dip in the sugar to coat.
3. To make the margaritas, fill a blender with ice. Add half the tequila, half the triple sec, the lime juice, and half the blackberry puree. Add a little more sugar if desired. Blend until totally combined and serve. Repeat with another blender full of ice, the rest of the tequila, triple sec, and blackberry puree!