Method 1 Grind mustard seeds and green chillies together into a paste. Rub fish with salt and turmeric.Place cooking pot in Smart Pot. Add oil. 2 Heat oil for about 5 minutes. 3 Add fish and all other ingredients. 4 Mix for about 2 minutes 30 seconds 5 Cover and cook for 1 hour 30 minutes. 6 Serve hot.