Rub the lime wedges around the rims of 8 stemmed glasses. Place the sugar on a small plate. Turn each glass upside down and dip the rims in the sugar to coat.
Place 2 scoops of sorbet in each glass and pour 1 tablespoon of tequila over the top of each. Serve with a spoon.
Tip: Let everyone dig in. For a nonalcoholic, kid-friendly version of the Lime Sorbet Margaritas, replace the tequila for each glass with 2 tablespoons club soda or seltzer.