Tamagoyaki (Japanese Rolled Omelette)

Whisk eggs, dashi stock, sugar, mirin, and soy sauce together in a bowl.

Heat ⅓ oil in a large nonstick skillet over medium-high heat. Add about ⅓ egg mixture; quickly swirl the pan to evenly cover the bottom. Start rolling up omelette from one side to the other as soon as it is set.

Keep roll to one side; add ⅓ more oil to the skillet and ⅓ more egg. Swirl the pan, ensuring entire bottom is covered, including around and underneath first roll; cook until set. Roll up omelette starting from side with first roll, and including first roll, so you end up with one roll.