Deep-fry the fish fillets in hot oil in a wok until golden brown, about 3 minutes. Remove from the heat and set aside to drain. Repeat with the eggplants.
Heat 5 tablespoons of oil in a pot over medium heat and add the mustard seeds. When the seeds pop, add the fenugreek, cinnamon and cardamom, and gently stir-fry for 2 minutes. Then add the dried chillies, shallo