Wash the rice and place it in rice cooker
Add soy sauce, mirin, sake, and dashi granules to the rice.
Fill the rice cooker with water up to the 2 cup line. Give the rice and seasonings a quick mix.
Break up cleaned mushrooms over the top of the rice
Place salmon fillet on top of the mushrooms
Close and cook begin the rice cooker (normal setting is fine)
When the rice cooker is done cooking, open the rice cooker and add the butter.
Mix everything up well.
Serve and top with any topping of your choice (like green onions or shiso). Enjoy!