Saute ginger and onion till caramelized.
When you start to smell the aroma of the ginger add the lemongrass.
Add the chicken and season with fish sauce.
Add enough water and bring to boil. When it starts boiling reduce the heat to medium and simmer for 15-20 minutes.
Add the sayote slices to the soup.
Few minutes after checking the sayote and if almost done add the bell pepper then the malunggay. Season with ground pepper and salt.