I buy the leftover bone from Heavenly or Honeybaked Ham, defrost it and then remove as much fat as possible. There's usually about a pound of ham left on the bone! - and I grind it with cheddar cheese and pineapple slices to make a great sandwich spread.
I pressure-cook the bone with the juice from 1/2 a lemon (or 2 tablespoons of vinegar) to get the cartilage dissolved. This makes thick broth for a bean soup base or for cooking greens, and once cooled, the fat can be removed from the top. The boiled bone finally makes it into the compost pile to release its calcium back to the earth.
Related: 
Recipes Using a Ham Bone
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