elhombresinnombre
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bmagda said:how is it poisonous?
Some beans - especially kidney beans - more especially red kidney beans - contain toxins which may be enhanced by gentle heating but are destroyed by cooking at higher temperatures. So if you are cooking raw or dried beans don't use a slow cooker set at less than 75deg C but sustained cooking at 80deg C or more will render them harmless. Tinned beans are cooked and therefore harmless.
Having said that, I don't know why people always tip away the water the beans have been cooked in. But they do, and I have always tipped it away too.