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Sounds like you have things under control now. All I was going to add (which you found out yourself) is that once the carcass has been cooking for a while, the cartilage and connective tissues tend to break down, at which time you should be able to break it into pieces.
I simmer stock for a long time, anywhere from 6 to 8 hours. In fact, "simmer" might be too strong of an adjective. Just faint, occasional bubbling is better. The last 2-3 hours I like to take the lid off to get some evaporation and concentration of flavors.
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