Tamago-yaki is usually cooked in square shaped fry pan. Though looking very hard solid piece of cooked egg, layer after layer rolling many egg sheets produces light texture. this cooking method can be also done with normal non-stick fry pan! It may be little tricky at beginning. but once you get the hang of it, you can make it with no sweat. What you put in egg mixture is up to you. Adding blanched spinach,shredded blanched carrot would also give nice color to your rolled egg!