To a pan kept on medium flame, pour 2 tbsp of Vegetable oil, drop star anise, cardamom, fennel seeds, and cumin seeds
Once it turns hot, drop the chopped onions and stir until the onion turn brwonish
Add ginger-garlic paste and green chilies
Stir until well sauteed
Once sauteed, add the spices powders and stir until the raw smell fades
After that put the chopped tomatoes and stir until the tomatoes turn mushy
Then add the chopped mint and cilantro leaves and stir well for 4 mins
Then to it add the marinated shrimp and stir until combined
Add salt and warm water
Close and cook for 15mins
Then to it add the lemon juice and stir well and take it off the stove