Rub the rim of each margarita glass with lime and use the sugar/salt mix to rim the glasses.
Making the drink:
To a blender add the ice, sparkling wine, tequila (if using), sugar, lime juice and fresh strawberries. Blend to the desired slush consistency.
Pour the mixture into the prepared glasses and garnish with a slice of lime and a slice of strawberry.
Enjoy!
Notes
You may need to add more sugar, depending on how naturally sweet the strawberries you use are! Adjust to taste preference! Also, I loved my drink without the tequila!