Amazes me how the different parts of our great nation are still so unique.
Here in the upper Midwest I'm quite sure you could search every baitshop within 150 miles and not find this thing called a cottonseed cake. I can't even find it online. Amazon has a large cottonseed cake listed as a catfish bait but no hole in the middle and unless you can easily break it apart would be too much for even a big catfish to swallow.
What about cottonseed would make a fish try to eat it? It sounds pretty dry/stuffy in the mouth.
I love learning new fishing techniques so thanks for sharing!