Preheat oven to 425°F.
Place raw bones in a heavy bottomed deep roasting pan, or on a parchment paper lined baking sheet and roast in the oven for about 30 minutes. You want the bones to be a darker color but not burn any residual meat.
If desired: remove the bones from the oven, brush them with tomato paste and return them to the oven for an additional 10 minutes. The acid in the tomato paste helps dissolve the connective tissue in the bones. It also adds a little extra flavor.
