Bitter melon duck carcass soup

Learned another popular recipe using bitter melon, to make a soup with pork ribs. After having roast duck, I thought to boil the carcass with bitter melon will have similar result. 

First long boiled the carcass then add bitter melon and carrot in the last half hour of simmering. Bitter melon still have a good dense texture and mild bitterness, the soup is nice.