Blackberry Margaritas

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. 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. 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! These are utterly delicious!