This family-owned Mexican restaurant in Pennsylvania has been serving time-honored recipes locals can’t stop craving.

Tucked away in Knoxville’s charming Fountain City neighborhood, Litton’s has been quietly perfecting the art of key lime pie while locals and visitors alike line up for a slice of tangy paradise.

There are certain foods that Florida does better than anywhere else on the planet, and key lime pie sits at the very top of that list. You’ve probably had key lime pie before, maybe at a chain ...