Hi Yellow Fingers, Sorry its's taken so long to come back. Here is the restaurant recipe for Biryani!
prepared chicken tikka, 1 tablespoon cashew nuts(not salted ones) 1 tablespoon sultanas, 12oz uncooked basmati rice prepared, 20 fl oz gravy base, 1 tsp garam masala, 1 tsp chilli powder, 1/2 tsp salt, freshly chopped coriander. For the garnish: 1 or 2 hard boiled eggs sliced or quartered and the same of sliced tomato.
Prep chicken tikka. Put 2 to 3 tablespoons of oil into a pan a heat through, add cashew nuts and stir until golden brown. Take out and drain. Do the same with the sultanas until they plump out and drain. Put chicken tikka pieces into the pan and stir fry for 2 minutes, add the cooked rice to chicken and cook for another 2 to 3 minutes until heated up thoroughly. Bring gravy base to a boil and turn down to simmer. Add garam masall, chilli powder, salt and stir well. Cook on simmer for a couple of minutes more. Pour gravy base over the rice and chicken and sprinkle over with cashews and sultanas. Finally garnish with boiled egg and tomatoes. Finally sprinkle over with chopped fresh coriander. Hope this helps, it's delicious! Let me know how you get on with it. It's all to do with preparation.