1. Rinse the beans. Put the cowpea in the filter and rinse it with cold water. Washing can wash away the dirt of cowpea and peel off the shell.

2. Put the beans in a pot of cold water. Make sure the water doesn't pass the cowpea completely, but don't put it too slowly or it will overflow when it boils. Cover the pot.

3. Boil the water. Heat water and beans over medium-high heat until the water boils. After boiling, continue to cook for 2 to 3 minutes. Most beans need to be soaked for several hours, but cowpeas can be soaked in hot water to reduce the soaking time. It doesn't matter whether it is soaked or not, so you can skip this step if you are in a hurry. Soaking can make cowpeas softer and help digestion.

4. soak. Let the cowpea soak in warm water for 6 to 9 minutes.

5. Drain and rinse. Pour the contents of the pot into the filter and filter out the soaked water. Rinse cowpea with cold water.