Soak chillies in hot water for about 30 minutes, or until soft. Drain, reserving water. In a food processor, blend chillies, garlic, ginger, turmeric and mustard seeds to a paste with a little reserved soaking water.
Slice eggplants into rounds 1 cm/½ in thick.
Heat oil in a frying pan, then add spice paste and stir for a few minutes to release flavou