Heat an earthen pot with four tablespoons oil. Saute the pounded ingredients, serai and curry leaves. Add in the rest of the ingredients and stir well. Mix in two tablespoons santan and blend well.
Add in the chicken pieces and mix well. Pour in half a cup of general santan and stir well. Bring to a boil. Add in the rest of the general santan and simmer till the chicken is cooked. Add in the potatoes. Add pati santan and blend well. Bring to a boil gently. Add seasoning.
Close the lid for a while to allow the oil to rise to the top. Serve with rice.