For the pork: Sauté shallots until they start to caramelize. Add palm sugar and stir over medium heat until it is melted and starts to turn an amber colour. Add the pork, soy sauce, fish sauce, black soy sauce, and just enough water to cover the pork. Stir to mix and dissolve the sugar. Let simmer gently, stirring occasionally, for about 30 minutes or until the syrup has reduced until thick and shiny.