Generally blanched vegetables will contain a certain amount of oxalic acid content, after consumption will cause the taste of the ingredients caused by a certain impact, not blanched, then there will be a bitter feeling, but the edible taste of the oil vegetables is relatively crisp, containing the content of oxalic acid can be ignored, and direct cooking will not be on the ingredients themselves to eat the taste of the problem, so the cooking can not be blanched. The cooking of rape can be done without blanching the rape.