Mohammad Chaman, a trader in Sadar Bazaar in Delhi was irritated with his customer during their first encounter (in May 2013). His customer had wanted 300 units of an item at a discounted price. From December 2013, the item has become a rage and Chaman sold as many as 3 lakh units. There is also a YouTube video detailing how to make this item. What is this item and who was the customer?
This day last year: Q.879