I use a small crockpot and simmer it all day or all night, depending when I ran out of hte last batch.
Today's batch was 1lb ground beef, 1 small sweet potato, 1 handful baby carrots. 1/2 cup water. Then a few shakes of cinnamon. Wow, it smelled great!
Then after at least 6 hrs, I mash with a potato masher until it is consistency of canned dog food, package in tupperwares and put in frige. Nom nom!
Dogs had niiiice breath after they ate it, cinnamon!