Soak bitter gourd strips in salted water for 30 minutes, then drain
Blanch the bitter gourd in boiling salted water with a little cooking oil for about 30 seconds, then remove and drain
Heat a wok and add oil from the canned dace fish
Add chopped garlic and stir until fragrant
Add the black beans from the canned dace and mix well
Add black bean paste and oyster sauce, stir to combine
Pour in 200ml water and bring to a boil
Add the blanched bitter gourd and the dace fish (deboned if preferred) to the wok
Cover and simmer on medium-low heat for 5 minutes
Add sugar to balance the taste
Add dark soy sauce for color (optional)
Add cornflour slurry to thicken the sauce
Mix well and serve hot with rice or porridge
