Mix everything together, it’s hard to set exact quantities. For us, it varies greatly how we like our omelet. Some prefer more soy sauce, while others prefer a sweeter omelet. But the rule is, taste the mixture. The final taste of the cooked omelet can be easily discerned in the mixture’s taste. Once everything is mixed, cook it up as shown in the video in the link below.
A small amount of egg on the pan, fold it together into a long narrow omelet. Pour a bit more mixture behind it, lift the omelet and let some run underneath. Cook it off and fold the omelet over, and repeat this process.
The finished omelet can now be sliced and used as a side dish to a curry, in a lunchbox, or traditionally, for Sushi slices on Nigiri or long narrow pieces for sushi rolls.
Pictures from my own creations in my own kitchen.
Bon Appetit.