Add the fish steaks, onion quarters, smashed garlic cloves, bay leaves, crushed green cardamom, cinnamon, a generous sprinkle of salt and a cup of water to a pressure cooker. Cook over a high flame, one whistle I would reckon. Allow to cool down on its own.
Carefully debone the fish steaks, mash the fish. Keep aside.
Heat 1 tbsp oil in pan, add the chopped onions and garlic, fry till a gorgeous golden.
Add the chopped green chillies, saute for a minute or two.
Add the mashed fish, tomato ketchup, salt and sugar. Cook over a low flame, stirring occasionally, for 5-7 minutes.
Allow to cool to room temperature.
Form 10 oval roundels, keep aside.