Chicken Biryani

Name: Chicken Biryani
Ingredients: * 2 bay leaf; * 1 tin chopped tomato; * 1tsp sugar; * 2 cup chicken stock; * salt to taste; * 4 large potato, peeled and cubed; * oil for frying; rice; * 3 cup jasmine basmati rice, cooked (i cook mine in the microwave; oven with 1tbsn turmeric and salt); * 1 cup chicken stock; for the buttermilk raita; * 1 cup buttermilk; * 1tsp ground cumin; * 1 1/2 tsp ground coriander; * 1/2 tsp turmeric; * 1/2 tsp chilli powder; * 1tbsn lemon juice; * 1 tsp salt