1. There is no hard and fast requirement to blanch shepherd’s purse, but due to the uncertainty of its origin, there are risks such as accidentally picking poisonous plants, pesticide residues, wastewater and gas pollution, and damage to vegetation, so we need to be vigilant. Blanching the water during cooking can also remove a certain amount of oxalic acid.

2. However, when blanching shepherd’s purse, you need to pay attention to the fact that because shepherd’s purse is relatively tender, blanching it for too long can easily lead to the loss of a large amount of water-soluble vitamins in shepherd’s purse. Therefore, it is generally recommended to blanch the shepherd’s purse. Wait for the water to boil before adding the shepherd's purse. Do not blanch the water for too long. Take it out quickly to avoid the loss of nutrients.