Soak the whole dried chiles in cold water for 10 minutes, then drain on colander using a spoon to press the chiles against the side to squeeze out the excess water. Use aluminum foil and wrap the whole chiles, shallot, sliced ginger, corriander seed and turmeric powder into a little package. Place this directly on the stove burner for about 2 minutes on each side or until fragrant. Then empty this into a mortar & pestle and pound it into a paste.