Add and heat the oil in the pan, throw in the slit green chili and curry leaves. Stir fry for a minute or two, so to release the aroma. Fry the onion slices until they turn a bit golden.
Then add the tomato dices and fry for 1 minute and after that add in the Okra pieces and stir fry for another minute.
Now you can add your clean shrimps to the pan. Stir fry and cook for 2 minutes. Optional: add in the shrimp heads for extra flavor.
Now add the tomato paste and the basic Goan curry paste and mix the content well.
Then pour in the vegetable stock or water, season with salt and mix well. Cover and cook for 18 minutes. Stir occasional. If you have added shrimp heads for flavor, take out the shrimp heads and discard after the curry finished cooking.
Serve hot with rice and a bhaji of your choice. A small amount of pickle would go well with the curry, such as Green Mango Pickle.
Adding the shrimp heads is optional because they give great flavor to the curry but if you are relying on frozen shrimp packets, you won't have shrimp heads.