How should I prepare a whole (already roasted) leg of lamb bone for stock?

So, I already made the leg o lamb and have some set aside for stew after I make the broth. I chopped the huge bone in half so it will fit in a lobster pot. The question for me at this time is: will it help to roast the bone for half an hour pre-stock?
I spent so long looking online with no specificity found on this question that I've grown impatient and already started roasting the bone at a lower heat than I might usually--only 325 F-- since I figure it couldn't hurt. But I wonder if it's necessary/helpful since the bone has been roasted (albeit beneath the meat) for four hours already.
Also, there is a little meat still on the bone before roasting, but mostly connective tissue and stuff.
Thanks for any tips about re-roasting leftover roasted meat bones!
Best Answer
It is good to roast the bone before using it for stock in order to get color on it. Color adds flavor, so it is worth it. Only the bone exposed in the oven in the original roasting will have gotten any color as the rest was covered in meat. Don't worry about cleaning it completely, a bit of meat here and there isn't going to hurt your stock.
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How do you make stock from lamb bones?
PreparationWhy do you roast bones before making broth?
Stock and/or Bone Broth Benefits Roasting your bones helps to create a deeper, fuller, and richer flavor from the caramelizing of the meat and marrow. Gelatin. The naturally existing collagen and connective tissue in the bones helps make your stock thick and gelatinous.How do you de bone a leg of lamb?
Bone broth is said to have healing qualities and contains lots of great nutrients. Bone broth contains collagen, marrow, protein, calcium, and amino acids. This has caught the attention of health food enthusiasts, who are now promoting bone broth as a superfood.How to Cook a Leg of Lamb | Jamie Oliver
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