Tom, I understand your feelings about organ meats. Of all of the original foods, I find that bone marrow is the most delicious and least objectionable. Other than eggs, bugs, and occasional small prey, it is also the first animal-based food our ancestors adopted. I buy a beef or pork thigh bone (readily available in most grocery stores) and ask the butcher to slice in into one inch pieces. I add the bones and some cubed meat to a big pot of water, bring it to a boil, and skim the foam. Then I add slices of fresh ginger and a pinch of salt, turn down the heat, and simmer it for an hour. Finally, I add fresh broccoli or spinach. When the vegetables turn bright green, the soup is ready. I have served these soups to many different guests, and never had any leftovers. Does anyone have any info on the nutritional content of bone marrow?