making huge batch of beef stock/bone broth
I have about 20 pounds of beef bones in the refrigerator, and a 22 quart roaster oven.. I plan to start the stock in the morning. I've seen a few suggestions to parboil the bones first, in order to reduce the amount of scum in the stock. How much does this help?
I plan to cook this for 2 to 3 days. I assume that if I let it sit on the deck, I would have a big problem with animals. Please tell me I'm wrong. ;)