1, pick both ends of fresh green beans and rinse them clean. In the process of picking green beans, if you can tear off the tendons on the green beans, try to tear them off to prevent them from fibrosis during storage. In order to facilitate blanching and preservation, fresh green beans can also be cut into long sections with uniform size. 2. burn a large pot of boiling water according to the amount of mung beans, and the water must be enough. When boiling water, you can also add a proper amount of salt or a little cooking oil, which can better protect the green pigment in fresh beans. Cleaning method of mung bean 1 Soak in clear water: wash vegetables with clear water first, and then soak them in clear water for about 10 minute, which can remove some pesticide residues. 2. Wash with rice washing water: Since most pesticides are acidic, they can be washed with weak alkaline rice washing water or fruit and vegetable cleaning agent first, and then washed with clear water.