Prepare the bitter melon by cutting in half, lengthwise. Using a spoon, scrape out the seeds and discard. Cut each half into 1 cm pieces.
Cook the bitter melon in boiling water for 10 minutes, until slightly soft. Drain and set aside.
Combine all the SAUCE ingredients in a small bowl and mix well.
Heat a wok or skillet over high heat until it starts to smoke. Add a tablespoon of oil. Add the garlic and stir for about 5-10 seconds, just until it begins to change color.
Add the pork and stir constantly until the pork is mostly cooked. This will be very fast since the pork is thinly sliced.
Add the bitter melon, black beans and SAUCE.
Stir constantly until everything is well combined and the pork is cooked through.