Have been visiting Dastarkhwan from past 11 years whenever I am in Lucknow. Would recommend Dastarkhwan Gomti Nagar as it has better sitting arrangements than the one at Hazratganj. Biryani is good and so is Chicken Kali Mirch. Chicken Masala is full of oil (eat at your own risk). Love the crisp Mughlai Parantha's they serve.