Heat the oil and cook the potatoes and keep aside
In the hot oil add the onion, chilli and allow the onion to sweat and turn light brown
Add the ginger and garlic paste and cook off the raw flavour
Add the shrimp, bottle masala, salt & pepper to taste
Coat the shrimp in the masala and allow to caramelize a little
Add the tomatoes, cover and cook for about 5 mins till the tomatoes are squishy
Add salt and pepper to taste again and add more bottle masala if required
Add the cooked potatoes back in and the coriander and serve