 Most recipes involve meat and offal from a calf, though, making sonofabitch stew something of a luxury item on the trail.Alan Davidson's "Oxford Companion to Food" specifies meats and organs from a freshly killed unweaned calf, including the brain, heart, liver, sweetbreads, tongue, pieces of tenderloin, and an item called the "marrow gut" and lots of Louisiana hot sauce.This last item, the "marrow gut", was a key ingredient.