Remove shrimp heads and black intestine line in the back
Boil shrimp heads in water to use as soup base
Crush the shrimp body
Add 1 tbsp fish sauce
Add 1 tsp of chicken knor
1/2 tsp of salt
Add 1/2 tsp of shrimp paste and mix all together
Put shrimp head and soup into a bowl
Add 2 tsp of oil
As purple shallot
Add a little water
Let sit until shrimps turn yellow
Add the soup base from earlier (without the shrimp heads) and wait till boil, add 1/4 tsp of sugar if you want the flavor to be less harsh. Wait till the water boil
Add bau and wait till it boil again
Remove the opo squash soup from heat as soon as it boiled and more condiments as needed. Enjoy!