The key masala/spice that brings an authentic biryani taste is the biryani masala, and I’m sure I’ve bought biryani masala. You may also make this masala in the home. The more time it marinates the better it tastes. Mutton needs to be marinated for at least 6-8 hrs. It helps https://messiahyobod.articlesblogger.com/54848399/biriyani-fundamentals-explained