To Prep
Combine all stuffing ingredients in a large bowl and mix well, marinade for 15 mins.
Add salt liberally to bitter melon and rest for 15 mins. Wash and drain, set aside.
Put stuffing mixture into bitter melon with a teaspoon, flat at the bottom and domed on the top. Repeat for all bitter melon slices.
To Cook
In a frying pan, heat 2 tbsp of oil over medium heat. Pan-fry the bottom of bitter melons until browned, about 3 mins. Remove and set aside.
Increase the heat to high, sauté garlic and chilli for about 2 mins or until fragrant. Other than the cornflour mixture, add the remaining sauce ingredients and bring to boil.
Place the bitter melons back into the pan and simmer covered until they are slightly translucent and stuffing is done, about 15 mins.
Add the cornflour mixture to thicken the sauce and turn off the heat. Serve immediately.