Microwave potatos for 5minutes until it is soft. Slice it into pieces.
Slice green onions.
Clean oysters with potato starch under running cold water to remove all of the dirt.
Heat the frying pan and pour sake and steam oysters for 2 minutes. Take out oyeters from frying pan, leave oyster broth in the pan.
Combine miso, sugar mirin in a small bowl. Pour it in the oyster broth and bring to boil until it is thick.
Place sliced potatos at the botoom in a plate. Add oysters and green onions and pour seasoned miso (step4) on it.
Place the cheese on the top of the plate.
Grill it in a toaster for five minutes until golden brown.
