In a cooking pot, add water, fennel seeds, whole coriander, bulb of garlic, ginger, all spices powder and bring to boil.
When stock is ready, separate liquid using a sieve.
In a large cooking pot, add a cup of oil and sauté finely sliced onions till golden brown.
In half of the fried onion, add medium sized prawns, yogurt, ginger garlic paste, crushed black pepper and finely sliced green chilies.
Sauté briefly and then add stock.
When stock comes to a boil, add rice, white vinegar and salt to taste.
When water has dried up, allow to simmer.
Garnish with fried onion and serve.
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