Ever since 2016, Mister Donut, Japan’s premier doughnut chain, has been teaming up with esteemed Kyoto tea merchant Gion Tsujiri for a series of limited-edition matcha doughnuts. This year, the two well-known brands are joining forces yet again, and this time the range includes a couple of special doughnuts that contain the most matcha ever used in Mister Donut’s history. There…