I found AB'S Dilli Durbar an average restaurant. You can have Maha Biryani, Butter Chicken or Kashmiri Mutton. Also, Sarson da Saag and Makki di Roti can be opted. I found food average and service good. I went AB'S Dilli Durbar with couple of friends last week. I was satisfied with the food but ambiance was awsome.