Many cultures use most of the animal. For example, in Korea a popular dish is called Sundae (soon-day), basically a kind of pork blood sausage. It's often served with pig ears and snouts as a side dish to alcohol.

https://en.wikipedia.org/wiki/Sundae_(Korean_food)

Pig liver is a popular in dishes the world over: pate, various sausages, etc.

It's surprising how much of a pig is useful as food.