Preheat the oven to 450°F (230°C).

Rinse, drain and pat the bones dry.

Place them in a roasting pan.

If the bones are cut lengthwise, place them cut side up. If the bones are cut crosswise, place them standing up.

Roast for 15 to 25 minutes (this will depend on how large the bones are), until the marrow has puffed slightly and is warm in the center.

To test for doneness, insert a metal skewer into the center of the bone, there should be no resistance when it is inserted and some of the marrow will have started to leak from the bones. Serve marrow immediately with spoons and smear onto Protein Bread if desired.