You cut open the gizzard and clean it out, it makes real good soup and broth, and I love breaded and fried gizzards. Grew up with them. And the few times I can get some farm raised chicken livers I have to fight my two cats for them. I love chicken livers.
One aside about gizzards...a friend who lived in the mountains above my town had a bunch of geese that escaped from their pen so she let them roam. When came time to butcher them she cut open the gizzards and found a couple of small pieces of gold. The whole family searched for years but could not find where those geese found the gold, and they sure did try!! Mariposa county used to be good gold country a long time ago!!