Heat up a wok on high flame/heat and add cooking oil. When the oil is heated, add the minced garlic and stir-fry until aromatic. Add the pork slices, shrimp, fish balls, into the wok and stir-fry until they are half-cooked. Add in the choy sum, bean sprouts, noodles, vermicelli and toss all the ingredients quickly with the spatula. Add the soy sauce, sweet soy sauce (kecap manis), water, pepper powder, and keep stirring until the noodles are cooked through, make sure not to overcooked the noodles. Dish out and garnish with some fried shallot crisps and serve immediately with a dollop of sambal belacan.