Wash the sweet pumpkin thoroughly, remove the seeds, and cut it into appropriate pieces.
Place the sweet pumpkin in a steamer and steam for 15 minutes.
Put soaked black soybeans or black beans into a pot and boil for 20 minutes.
Add the boiled beans and steamed pumpkin to a blender.
Add milk or soy milk and salt, then blend until smooth.
Chill, serve in a bowl, and enjoy.