Here in Toledo, Ohio we are well known for a "certain" family's restaurant chain. People coming from out of town know, and usually high-tail it to one of the "famous" establishments for a Margarita like no others. It is a guarded secret. (Don't tell that I let you in on it!)
The recipe is simple.
Even better if you mix ahead and store in freezer for a few days or longer.
Shared with Recipe Goldmine by Ruth Gwynne.