Slice onions in 3 millmeter thick.
Chop the chicken in 3 centimeter block.
Make a square whole in the center of the bread. Please keep the bread took out as it will be used in later process.
Stir fry chicken on medium heat, Once chicken gets lightly cooked, add onions and continue stir frying together.
Add sugar, mirin, and soy sauce to the pan and mix together.
Once chicken and onions are mixed with the sauce and look a bit sticky, stop the heat.
Put the chicken and onions into the whole of the bread.
Put the bread piece on top of the chicken.
Sprinkle shredded (pizza) cheese on top of the bread.
Heat the bread in oven toaster for 8 minutes.
Once cooked, sprinkle seaweeds on top.