I've made this twice now, once with beef bones and once with chicken bones. For the beef bones, I did roast and add vinegar and made it in my crockpot on low for 48 hours. It had a nice rich flavor and made my husband and kids drank it when we started to feel the onset of flu symptoms. Amazingly, none of us were sick more than a day and I partially attribute it to the broth. When I made with chicken bones, I was feeling lazy so I didn't roast them first and I thought it still came out pretty good. Very easy when you use the crockpot.
Fantastic and very clear directions. Thanks for posting!