The reason they have to be boiled for 10 minutes is that beans have a digestion inhibitor, presumably so they pass through animals intact and germinate nicely in the waste. It's not good for humans though, and boiling solves the problem. Once boiled, they can then be added to any slow-cooked dish without any problems.

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Sarah

“Tell me one last thing,” said Harry. “Is this real? Or has this been happening inside my head?”
“Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?”