Heat your Tamagoyaki pan on the stove over medium heat.
Add a layer of oil. You can help distribute it evenly by wiping a paper towel piece across the pan using the cooking chopsticks.
Pour some egg mixture into the pan (if you're using three eggs, about 25% of the total volume) and tilt the pan to distribute it evenly. Be quick, as it soon begins to stick. The layer should be a few millimeters thick.
If air bubbles form, break them with your chopsticks. If there are holes or very thin spots, feel free to pour a small amount of egg on top to fix them.
Fry the egg until no longer translucent or runny. Traditionally, it should be browned only very slightly or not at all, and retain a uniform yellow tone.
Now for the tricky part. Using your chopsticks and/or whatever helps keep the egg as intact as possible (such as a spatula), start folding the egg layer towards the handle side.
If the egg sticks to the pan or falls apart, you're probably moving it too early, not using enough oil, or the pan is not hot enough. If the inner layers look messy, don't worry. Only the last one needs to look clean.See process photos above. Push the egg to the far side from the handle, as it's usually more easier to fold all layers towards the handle.
Distribute some more oil in the pan to prepare it for the next egg layer.
Pour in another layer. Lift the existing cooked egg up a little and tilt the pan so the fresh mixture flows underneath and connects the layers.
Fry once again until the new egg layer can be separated from the pan without falling apart.
Now, starting with the side that your rolled previously (which will become the innermost layer), roll the omelet once more, away from the handle.
Repeat the steps a third time and a fourth time until you're out of egg mixture. Don't forget to move the egg to the far side from the handle each time, and lift the egg when pouring in fresh mixture.