The dictionary mentions intestines, and scraps.They used to use intestines to make sausages, and that was a dandy way of getting botulism.(look that one up.) Much of the rest used to go into hotdogs. No thanks. So offal to me is hardly more appetizing than the "off-fall" so often washed away by the retromingent bovines.

A nicer word for gravy makings is giblets: heart, gizzard, and neck.