Measure and pour the tequila, triple sec, lime juice, and simple syrup (if using) into a blender jar. Add strawberries and ice, and blend until smooth.
Serve:
Pour the frozen margarita into four glasses, or keep extras in the freezer.
Notes
Fresh strawberries: wash and remove the stems. Blend 1 ½ cups fresh with 2 cups of ice.
Single: 1 ½ ounces tequila, 1 ounce triple sec, 1 ounce of lime juice, ½ ounce simple syrup, and ½ cup of frozen strawberries.