My first year in High School, the School had moved to a new facility. It had a 6 acre Phys Ed field. All 6 acres were covered in Sandspurs.
Before we could use that field, all 6 phys ed classes for each day was spent carefully removing Sandspur plants and piling them up to be Burned. (By the Coaches, they weren’t silly enough to let students anywhere Near the fires)
I believe that Chicken bones are very rich in gelatin.
As are Pigs Ears. To get gelatin from them, all you need to do is cut them up into small pieces, cover them with water and simmer for a couple hours. When it cools off, the liquid turns to pork jello.
Any other treatment than slow simmering is to remove the Pork Flavor.
Some Delis sell a slightly different version of this with scraps of lean pork in the gelatin and call it Head cheese. It is usually sliced and used as a sandwich meat. It is one of those choices that only sells well in certain neighborhoods.
Luckily, I grew up in Daytona Beach where beach access had already been cleared, for the most part.