Because there is an endotoxin in the beans, it needs high temperature to destroy them. Therefore, it must be heated sufficiently to boil, or heated for 10 minutes or more to ensure that the long beans are cooked thoroughly, so that it will not affect health when eaten. When boiled beans are boiled for 5 minutes, the saponin production reaches the highest point, and then it will gradually weaken. When boiled for 20 minutes, the toxin of beans will completely disappear.

Method for judging that beans are ripe

1, the color darkens

Generally, the color of raw beans is mostly light green. After the beans are cooked, the color will turn dark green. If all the beans turn dark green, it means that the beans are almost cooked.

2. The taste becomes soft

Taste the beans carefully. If they are not cooked, they will taste beany, while the fully cooked beans will taste soft without beany.