The Great Halloween Turnip
Ireland Halloween tradition was that the Jack-o'-Lanterns were hollowed out turnips.*
The tradition came to the in United States in the 1800s and Pumpkins replaced the turnips.*
Now, you know just a wee bit more by reading Chicken-Fat than you did two minutes ago, even it is plagiarized, but reworded, material.
*UNCLE JOHN'S BATHROOM READER page-a-day calendar, October 31, 2011