Do I need a tamagoyaki pan?
No. A rectangular pan is nice for perfect edges, but a small 8-inch nonstick skillet works great. A 10-inch skillet works too, but the layers will be thinner and you may need a couple extra pours. Your omelet will be more rounded, still delicious.
What is dashi, and what can I use instead?
Dashi is a light Japanese stock (often kombu and bonito). For easiest home cooking: use instant dashi powder mixed with warm water. No dashi? Use low-sodium chicken broth or even water. You will lose a little depth, but the omelet still lands.
Why is my tamagoyaki watery or weeping?
Usually one of two things: the pan is not hot enough so the egg steams instead of setting, or you used a lot of liquid without adjusting heat. Keep layers thin, use medium-low heat, and wait for the surface to be mostly set before rolling.
Why is it browning too much?
Heat is too high. Drop to low and give the pan a few seconds to cool before the next pour. Light golden patches are fine, but if it is getting spotted fast, you are sprinting.
Can I make it less sweet?
Yes. Cut sugar to 1 teaspoon and keep everything else the same. Also note: mirin sweetness varies by brand, so if yours is on the sweeter side, start with less sugar and adjust next time.
What can I add to the layers?
Try chopped scallions, nori strips, or a thin line of cooked spinach. Keep add-ins small and dry so the roll stays tight.
How many layers should I expect?
With 6 eggs, you will usually do 5 to 7 thin pours, depending on pan size and how thin you like your layers.