My father's fee for killing a pig was, I believe, half-a-crown, plus the offal.
-- Ralph Whitlock, The folklore of Wiltshire
Younger generations developed an aversion to their grandpa's "chocolate," and some households began serving two separate dinners, one with offal for the elders and another offal-free for the youngsters.
-- Stewart Lee Allen, In the Devil's Garden: A Sinful History of Forbidden Food
Offal is a combination of off and fall, referring to parts fallen or cut off.