Wouldn't know how to butcher one or make soup out of it....
Once upon a time in my younger days, we set some gill nets out for a fish fry. We caught some large soft shell turtles along with buffalo and carp, so being about 4/3 drunk, we butchered some of the turtles and fried some chunks along with buffalo fish. It tasted good but was so tough you could never get a piece worked up enough to swallow. I am thinking pressure cooker.
miles