I usually make my bone broth from grassfed bones from Whole Foods. Last time they didnt have any grassfed bones, so I just picked up normal ones, also from WFs.
When I use the grassfed bones, I keep the layer of fat that forms on top. Sometimes I skim it off and use it to fry veggies. I figure this fat must be good since it comes from a good source.
Should I throw away the fat from these non-grassfed bones? Safe to eat? Too much Omega-6?
Question. Is the fat that is rendered while making broth good to eat? I've always used it, but wonder if it's still good since cooking fat for a long period of time can oxidize it. I've seen some recipes recommend simmering bone broth for several days. I know at a certain point, I can actually smell the rancidity as the broth is simmering. Does anyone have a source that says how long you can simmer each type of broth before the oxidation? I know it's different for each type of meat.
Now I feel like a dunderhead. It never occurred to me to keep that layer of fat I take off the top. I am always so focused on getting that fat out of my bone broth because it makes it taste so bad, that I never thought to use it in another application!
I get grass-fed bones from a farm, but here is how I handle the fat issue. I first roast the bones for about 40 minutes. This cooks the marrow and renders most of the fat from the bones. I save the marrow and fat for consumption, and then make the stock with the roasted bones. When additional fat rises to the surface of the pot, I just skim it off and I don't use that fat, having plenty from the roasting. You can very quickly get any remaining fat out of the pot so when you cook the stock for hours (I do 24-36), the house doesn't smell like the fat, and you aren't worried about consuming rancid fat.
I should say, I don't know that there is anything wrong with fat that has been cooked for 24 hours, but since I am not sure and I don't like the way it makes the house smell, I prefer to only eat the quickly rendered fat. I make bone broth about once a week, so there is no shortage of fat in the house.