Like slice pizza and smash burgers bagels are having a moment. One concept Pop Up Bagels was just valued at $300 million in its most recent round of financing. Pop Up's rip and dip bagels are a viral sensation but have left some traditional bagel purists unimpressed. One of those purists is the great chef turned master bagel baker Mark Strausman, so we traveled to Mark's restaurant Mark's Off Madison to talk and taste bagels.