1. Blanch the beans for 3 minutes until cooked.

2. There are four common types of beans on the market: green beans, lentils, cowpeas and snow peas. Whether the beans are shredded or cut, the purpose of blanching them is to remove the saponins in the raw beans. Toxins and plant lectins are toxic substances. These four kinds of beans all contain the above toxins. French beans and lentils have the strongest toxins and need to be boiled for 3 minutes to remove the toxins. Snow peas and cowpeas have lower toxins and can be boiled for 1 minute. Can.