Yup, that's a cutting board full of fat. Vegetarians and weak stomachs: avert your eyes- things are about to get a little homestead-y.
I don't think my poor husband will forget the day that I asked him to pick up a 10-lb. bag of beef fat from the local health food coop. Poor guy didn't know what he was getting into. Just had to wander back to the butcher counter and tentatively ask if there was any fat back there for "Amber". Sure enough, they lugged out a whopping bag of trimmings labeled with my name and handed it over to him. Did I mention that he is awesome at supporting whatever harebrained ideas I get into my head? Although I do like to think that he felt a little triumphant (in a primitive hunter sort of way) as he walked right past the cash registers with his free bag of fat, telling them that he didn't have to pay for it.
"Oog. Me provide for family."
I think it was a lot less majestic in his experience, but I like to think I at least keep him entertained.
A lot of people say that the leaf fat around the kidneys is the best for this, but I couldn't find any and this fat was free, so I went with this one. It worked out just fine, although the rendered tallow isn't quite as hard as the leaf fat tallow and it takes a little more fat to get the same amount of tallow. So, aside from the quantity and hardness of the final tallow, the only thing that was sacrificed was my husband's pride. Poor guy.