Once cooled a bit, remove all but about 3 tablespoons of the oil from the wok. Place over high heat and toss in the mustard seeds. When they begin to pop, reduce the heat to medium-high, add the
cumin seeds, curry leaves and green chillies and fry for a further 30 seconds. Stir in the garlic and ginger and fry until fragrant and soft about I minute should do the job.