pork ribs (or 1 pack from the supermarket) • galangal • shallots, halved • lemongrass, cut diagonally and halved • kaffir lime leaves, torn in half • or more straw mushrooms (or any available mushrooms like enoki, shimeji, or a mixed mushroom pack from the supermarket) • or more tomatoes, halved • green onion or cilantro, chopped • chili powder (reduce if you prefer less spicy) • dried or fresh chilies (reduce if you prefer less spicy) • water (divided for two boils) • tamarind paste •