Ian Kleinman plans a second doughnut pop-up later this month at Bittersweet
For a few days late last summer, Ian Kleinman, Denver’s Willy Wonka double — and the founder of the Inventing Room, a catering company that centers around magical, mystical, molecular marvels — took over the dining room at Table 6, where he morphed the rusticated space into a doughnut paradise,…