Using a half-cup measure, scoop up potato mixture and place in the skillet. With a spatula smooth the round into a 3-3 1/2-inch circle about 1/3-inch high. Continue with remaining potato mixture.
Cover and cook for 5 minutes. Turn potato cakes over and cook on that side for 5 minutes, covered. Remove cover, turn cakes over and cook for 2 minutes, uncovered or until spotty, golden brown. Turn again and cook for 2 minutes more, uncovered. Remove to cooling rack. Cakes can be reheated briefly in dry skillet over medium heat if making ahead of time.; Leave it to Japanese scientists to discover the best and least messy way to eat a burger:; ; –