Place all ingredients for the margarita into a high powered blender. Puree until smooth.
Finely chop the basil leaves and place in a the base of a mortar and pestle along with the salt and sugar. Finely crush the basil leaves into the sugar and salt. If you don't have a mortar and pestle, use a small food processor (make sure the leaves are very dry) or crush with the back of a large knife.
Place the basil salt onto a small plate. Rub the squeezed lime around the rim of each glass then roll the rim of each glass in the salt.
Divide the margarita mix among 4 glasses and serve immediately.
Notes
Both fresh and frozen strawberries work here. If you are using frozen, start with only 1/4 cup of ice and go from there. The strength of your blender will determine how much you need. If you over blend and it's too thick, thin with a little water or more fresh lime juice.