I am looking for restaurants that have authentic MUTTON biryani in Hyd. Suggestion?

I have spent almost 2 years in Hyderabad but haven't had a lot of luck with good mutton biryani. It would be great if you could suggest restaurants and the biryani I should go for. Thanks!

Edit: I've heard (original) Bawarchi is good (many restaurants have stolen its name). Any thoughts?