Heat a kadai and dry roast all the spices mentioned in “For Chettinad masala” section except grated coconut.
Once the spices turn aromatic add grated coconut and roast till coconut turns brownish. After it turns brownish, switch off the gas and let it cool.
After cooling, grind it into thin coarse powder.
Heat oil in a pressure cooker, add curry leaves and fry for few seconds.
Add ginger paste and garlic paste and sauté for a minute.
Add onions and sauté till it turns soft.
Add tomatoes and sauté till tomatoes turn slightly mushy.
Add marinated chicken, ¾ th cup water and mix well. Close the lid of the pressure cooker and cook for 4 whistles. Switch off the heat and wait till the pressure gets released.
Pour the contents of cooker into a kadai or deep bottomed utensil. If you want to make gravy, add 1 cup water.
Add the ground masala and mix well. Cover and simmer for 15-20 minutes.
Garnish with finely chopped coriander leaves.