Rim a margarita glass by rubbing a lime wedge around the edge and dipping it into granulated sugar.

Place the strawberries, tequila, lime juice, triple sec, agave nectar, and ice into a high-speed blender.

Blend on high speed until the mixture is smooth and reached a slushy consistency.

Pour the blended mixture into the prepared glass.

Garnish with a fresh strawberry or a lime wheel and serve immediately.