Rub a lime wedge over the rim of your serving glasses to moisten the edges, then dip in the margarita salt and/or sugar (I love to use a mix of the two!). Set aside.
In a blender, combine frozen strawberries, ice, tequila, Cointreau, and lime juice. Start blending on the “crush” or "medium" setting and adjust as you see fit until everything is combined, smooth and to your desired consistency.
Evenly distribute between your two prepared glasses and garnish with fresh strawberries and/or lime wedges. Serve immediately and enjoy!
Can be stored in an airtight container in the freezer for up to 1 month. When ready to drink, just throw it in the blender for a few seconds to loosen it up, pour and serve!