According to the 39 health network query, blanching time is too long will make the bean curd harden so as to lose its own taste, and the color is not good, generally wait until the pot of water boiling can be put into the bean curd, about blanching five minutes or so can be.

The long bean horn, generally referred to as cowpea, is a twining, herbaceous vine or suberect annual herb of the family Leguminosae, genus Cowpea. It has subglabrous stems, pinnately compound leaves, axillary racemes, and flowers clustered at the tips of the inflorescences.