Peel potatoes and cut them into four pieces or smaller if you prefer. Add a few tablespoons of water, cover and steam for 5 minutes in the microwave. If you prefer you can also fry them and set aside
Heat 2 tablespoon butter and 1 tablespoon oil in a large pot. Add the cumin seeds, cinnamon sticks, cardamom pods, clove, bay leaf, peppercorns and fry until fragrant. Add the onion and fry until golden brown and caramelized
Add the ginger/garlic paste and fry for a minute. Add the masala, turmeric, chilli powder, cumin, coriander, garam masala and fry for 2 minutes. Add the chicken and mix well. Leave the pot open and allow it to fry for 10 minutes on low heat. Add a few drops of water only if required
Add tomatoes and tomato paste. Cover and cook for 10 minutes. Preheat oven to 160 degrees Celsius
Add the rice, potatoes, coriander and mint. Add 2 cups water or less, depending on how soon your potatoes will be able to cook. Bring to a boil. Cover and cook in the oven for an hour or more, until potatoes and rice is cooked. Half way through cooking cut up the butter into little cubes and place it in the pot. When cooked the Akni should remain a little moist but not mushy