Prawns in Spicy Onion and Gravy

ingredients
Prawns - 200 gms (cleaned and de-veined)
finely chopped onion - 300 gms
coriander powder - 2 tbsp
chilli powder - 3/4 tbsp
turmeric powder - 1/4 tbsp
chopped coriander leaves, 3 tbsp
mustard - 1/4 tbsp
curry leaves - a few
oil - 3-4 tbsp
salt to taste


Preparation:
Cook the ingredients from 2 to 7 together in a pressure cooker for 2 whistles with salt and very little water as onions leave water after cooking. Then add the cleaned prawns to the cooked masala and stir it for 10 mins till the prawns are cooked. Heat oil in a fry pan and add mustard seeds, curry leaves and then the cooked prawn masala and keep stirring till the gravy is thick. Add little black pepper powder and chopped coriander leaves if required.