Combine brown sugar, chili garlic sauce, sesame oil, and white pepper in a small bowl and set aside.
Heat skillet till hot. Add the cooking oil when pan starts to shimmer. Swirl pan to coat oil all over bottom. Add the ginger and garlic, stir till fragrant. Add the scallion, red pepper, and fermented black beans, and stir fry the mixture for about 15 seconds. Add Shaoxing wine, clam broth, and soy sauce. Stir till mixed and liquid starts to boil. Add the clams and cover. Cook for approximately 4 minutes or until clams have opened. Once a good number of them have opened, remove the cover and give everything a stir.
Stir in the sugar, chili garlic sauce, sesame oil, and white pepper. Discard any of the clams that didn’t open. Taste and adjust, you can add a bit more chili garlic if you like it spicier. Add about half of the corn starch slurry to the liquid in the skillet and stir. Add more slurry if needed to further thicken the sauce.
Stir in the chopped cilantro and gently stir the mixture so the sauce coats the clams.
Serve immediately. Best way to eat them is to slurp them right out of the shell so you get the delicious sauce in every bite.