Pie is always a delicious treat, no matter the season, and everyone has their most popular pie flavor. "They had a honey filling covered in a crusty cake made from oats, wheat, rye or barley. Instacart has a study up with the most popular pies in each U.S. state. For Florida, the top pie is key lime pie. That's totally appropriate for this state since this state is famous for its delicious key lime pie.