In a pan add some oil and shallow fry the marinated prawns
Fry them till they are 90 percent cooked it takes about 4-5 minutes and take them out
Now in the same oil add Cinnamon, Cumin, Bay leaf and fennel/sombu
Now add Chopped onions and saute them
Add Ginger garlic paste and curry leaves and saute them till raw smell goes
Then add Curry masala powder (else add chili powder, coriander powder and cumin powder)
Now add chopped tomatoes and cook them till they are soft
Add the fried prawns and mix well with onion tomato base
Then add salt and mix well with the curry ( be careful while adding salt as we have added during the marination also)
Add 1/4 cup water (prawn tends to oozes out water so add water accordingly) mix and cover and cook till the prawns are done
Once the prawns are cooked and reached semi gravy consistency switch of the flame and garnish it with coriander leaves
Serve it hot with rice roti or idli dosa