You just have to sacrifice the presentation of the tamago, as it won't look so smooth and nice looking. But who cares, when the taste is the same, right? :)
Here's what you need:
1. 2 eggs
2. 1 tablespoon of Mirin (I don't have Mirin, so I use grain vinegar)
3. 3/4 tablespoon of sugar
4. 1/2 dashi stock (I don't have dashi stock as well, so I use chicken stock)
5. One or two small drops of light soysauce.
Here's how you make it:
1. Beat the eggs and mix all the ingredients into the egg, and mix all together.
2. Put the mixture on microwave container (preferably on the square-shaped container, if you want to make tamago sushi later)
3. Put inside the microwave, and heat it in high temp for 1 - 1.5 minutes.
And there you go the tamago...
You can cut the tamago nicely to make tamago sushi as well. Click here to see the recipe for sushi rice.