Dashimaki Tamago is a very typical Japanese dish. Especially, it's often made for bento at home. The recipe is different from family to family. Some people don't add sugar; some people use mirin instead of sugar. Here is just one of the recipes. Actually, I sometimes leave out soy sauce, sugar, or even dashi (actually if you don't use dashi, it may be called Atsuyaki Tamago). Sometimes I may add extra sugar. It all depends on how I plan to serve the Dashimaki Tamago, or how I feel when I'm making it. So you can adjust this recipe to your taste!