Black Pudding or Blood Sausage is a complete unknown in the US. Liver is reviled. Gizzards are occasionally sold in restaurants as an appetizer, fried. We don't need the offal from our animals because we can just buy a plastic jug of broth from the store.

It's certainly a less desirable part. https://en.wikipedia.org/wiki/Chopped_liver#Chopped_liver_as...

I'm aware that stomachs are used in haggis, or intestines in sausage. That doesn't represent the majority of human meat consumption though.