This summer has been hot, so this is a common summer soup to relieve heatiness and cool down the body. My maternal grandma - Ah Poh is Cantonese, so drinking soup is important to my cantonese part in me. My Ah Poh does not know how to even boil a pot of water, she had a 'Mui chai' who came along with her when she got married. I later found out that was why i had 2 'Tai Yee Mah' cos Ah Poh had considered her as her daughter. Although Ah Poh did not know how to cook, she was an expert in criticising all foods served. She had been branded with the saying - 'Hue Than mng hue cheong". I remembered that she reminded my mother that a little piece of 'Tai Tau Choy' had to be added to Winter Melon Soup to enhance the flavor of the soup. There are a variety of additions you can add to make this soup flavourful and unique and 'Tai Tau Choy' is a must for me.
Salt to taste
Put pork ribs in the pressure cooker and put in enough water to cover the ribs. Bring it to the boil and conitinue to boil until all the scums rise to the surface. Remove all the ribs and wash away all the scums. Discard the water in the pressure cooker and wash preassure cooker really well.
Cut winter melon into small cubes of 1″ (remove seeds and skin)
Put cleaned ribs back to the pressure cooker together with the rest of the ingredients except the salt. Put in the water that mushrooms and dried octupus were soaked. Top up with more water until it is enough to cover the ingredients. Close the lid of the pressure cooker and pressurized for 30 - 45 minutes, counting from the time the pressure cooker starts hissing.
Turn off heat when cooking time is over and let the pressure released by itself before opening the lid.
Taste the soup before adding salt as tai tau choy can be very salty.