About the bones. If you don't have easy access to marrow bones, simply place a call to your local butchers a few days in advance and they most certainly can help sort you out. Have the butcher cut the bone(s) in half lengthwise so it is easy to scoop out the marrow.
These recipes were created in US Customary measurements and the conversion to metric is being done by calculations. They should be accurate, but it is possible there could be an error. If you find one, please let us know in the comments at the bottom of the page