Pie is always a delicious treat, no matter the season, and everyone has their most popular pie flavor. The Most Popular and Loved Pie in New JerseyPies date back a very long time. "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 New Jersey, the top pie is Boston Cream Pie.