Overview: "Donburi" is a bowl of rice with various toppings. It's quick, cheap and tasty, making it one of Japan's favorite comfort foods. A huge number of options range from the classic Katsudon (fried pork and egg) to the extravagant Kaisendon (seafood selection). This time, our theme is "Donburi." Chieko Mukasa, a food journalist, explains how it became so popular. And in Plus One, Matt Alt travels to a region that's boosting tourism through innovative "Donburi" recipes.