Just a follow-up on what I did.
I bought a whole pastured lamb, which came with a bunch of parts no one was going to eat. I ground up the liver (huge), kidneys, hearts (3, for some reason), and lamb fries (also 3) and froze them in little 2 oz portions. I mix one portion with 2 lbs of ground meat, and my family loves it. They've had meatballs in a marinara sauce and breakfast sausage so far, and have loved them. And I'm never telling them what they're eating.