Wash the soybean and immerse them into the water (water has to cover the surface of the soybean). Then, put them in the fridge for one night.
Separate the pickled sour mustard into slices then immerse them into the water for about half an hour. Rinse again. Cut them into big slices and pan fry them in the wok without using oil.
Wash bitter melon and cut both ends. Cut them half longitudinally and remove the core. Cut them into big slices.
Wash, flatten and cut the ginger into slices.
Peel off and flatten the garlic.
Put the ribs and water in the pot on medium heat. Drain after boiling for about one minute. Wash the ribs again.
Boil 3 liters of water in the pot with high heat. When it boils, add the ribs, soybeans (& water), the ginger and garlic into the pot. Then change to low heat for about 30 minutes.
Add bitter melon, pickled sour mustard and boil them for about 30 minutes. Taste test before adding more salt.