Marrow bones are lovely just by themselves. I just pan roast them to get good color all around, then serve them with a lovely piece of bread.
But if you want to use them for broth, I'd definitely roast them first, I don't care for beef broth made with raw bones. Just be aware that a good deal of the marrow will melt into the pan when you do this, so just scrape it out into your stock pot.
But if you want to use them for broth, I'd definitely roast them first, I don't care for beef broth made with raw bones. Just be aware that a good deal of the marrow will melt into the pan when you do this, so just scrape it out into your stock pot.