Cover the pork with cold water in a pot and bring to the boil. When the scum rises to the top, drain the pork, rinse it under fresh cold water and pat dry with paper towel.
Heat a wok until just smoking. Add the peanut oil to the wok and, when hot, add the dried chillies, garlic and ginger and stir-fry until fragrant. Add the bean paste and stir-fry for a minute more. A