One of the most popular dishes in Indian cuisine is butter chicken with its creamy tomato gravy and succulent chicken marinated in subtle spices. But who exactly cooked it up first is the subject of an ongoing lawsuit in India. Two restaurateurs whose grandfathers moved to New Delhi from Pakistan as refugees and worked together in a small restaurant in the old part of the city are battling it out in court. From Delhi, Sushmita Pathak reports on the clash between the two restaurants over a beloved dish.