Wash whole fish and mark cuts on it.
In a bowl mix together onion, ground red chilies, ginger garlic paste, lemon juice, crushed red pepper, black pepper powder, turmeric, white pepper, black pepper and salt.
Also add ketchup and mix well.
Now marinate fish with the mixture.
Now wrap marinated fish in a silver foil, cook in burning coals or grill in oven.
When the fish is tender, remove in a platter.
Sprinkle top with lemon juice and serve with seasoned salad.
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