Clean and drain the crabs, cut into large pieces.
Wash, seed and shred the bitter gourd.
Wash, seed and finely shred the red chili.
Rinse and finely chop the preserved black beans.
Saute the preserved black beans, red chili and ginger over high heat, add the crabs and cook until 60% done.
Add the bitter gourd, stir well, seasons with light soy sauce and salt.
Cover the lid and cook for 2 minutes until done.