Tamagoyaki—a Japanese rolledomelettraditionally flavored with soy sauce, mirin, and, depending on who you ask, dashi (a simple fish and kelp stock)—is notoriously difficult to make. InJiro Dreams of Sushi, the 2013 documentary that follows revered sushi chef Jiro Ono, it's mentioned that it takes the apprentices at his restaurant, Sukiyabashi Jiro, an average of10 yearsto master the dish.