What crucial step must be performed with the soaking water after soaking dried kidney beans?
Answer
Discarding the soaking water
When preparing dried kidney beans, discarding the water used for the initial soaking period is a critical safety measure that must not be skipped. During the soaking process, some of the lectin phytohaemagglutinin leaches out of the beans and into the surrounding water. If this water is subsequently used for boiling or cooking, these toxins are reintroduced into the food, potentially leading to severe illness even if the beans are boiled afterward. Therefore, after soaking for the required duration (at least five hours), the soaking liquid must be completely emptied and replaced with fresh water for the necessary boiling phase.

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