Rub the rim of two margarita glasses with a lime wedge. Swirl the rims through a small pile of kosher or sea salt.
Pour into glasses and garnish with blueberries and lime.
Nutritional Information for 1 margarita: Calories 242, Carbohydrate 23g, Fat 0.1g, Saturated Fat 0g, Protein 0.2g, Sugars 8g, Fiber 0.8g