Major, I wasn't sure what you meant by "on the rock" cooking, but I looked it up and I think you mean what we call pit oven cooking. Which is where a hole is dug in the ground, a fire lit and rocks placed over heat. Then a kind of lid, made of sticks etc is placed over until the rocks become very hot. The lid is removed and meat is placed on the hot rocks and then covered again with hot rocks and the bush/shrubbery lid.
But in answer to your question, no, I have only seen it done, but never eaten meat cooked in a bush rock pit oven. I've heard of whole pigs being cooked this way though (takes a long time) and the meat is supposed to have a deep smoky flavour and is very tender.
Found this Youtube clip about it. You only need watch the first minute or so to get the idea.
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And if anyone has a squirmy tum, don't read any further .....
I saw skinned cats strung up in the markets of Singapore for sale, but I never saw them being cooked, just the sliced meat presented on my plate.
What you described with the Asian market cats is just outright horrific.
aarrgghhhh I don't even want to think about that unbelievably cruel and torturous act.