Pour 300 g uncooked Japanese rice into a bowl and fill it with water. Swish, drain and repeat 3 times to wash it. (It's okay if the water is still cloudy.)
Add enough water to cover the rice and soak for 1 hour.
Place 2 dried shiitake mushroom and 3 g dried kelp (kombu) in 300 ml cold water and soak them for one hour. This will make a shiitake and kombu dashi.
After the rice has soaked for 1 hour, pour it through a sieve to drain and place over an empty bowl to dry until it's time to cook.
Remove the shiitake mushroom and kombu from the bowl, the liquid inside is a light dashi that we will use later. Finely slice the rehydrated shiitake mushroom and discard the kombu. (Alternatively, use the kombu to make kombu tsukudani rice ball filling.)
Peel the skin off of 150 g boneless chicken thigh and cut it into bite-size pieces. Cut the meat into small pieces and set aside.
Heat a small frying pan on medium and once hot, add ½ tsp cooking oil and the chicken skin. Place a lid on to prevent the fat from splashing and fry on both sides until crispy and golden, then rest on kitchen paper and set aside for later.
Wipe out the excess rendered fat, then use the same pan to sear the chicken meat all over.
When the chicken is no longer pink , add the sliced shiitake mushrooms from the dashi to the pan along with ½ carrot, ½ thumb ginger root, and 3 small sheets fried tofu pouch (aburaage). Stir fry them for a minute to allow your other ingredients to absorb some flavor from the chicken juices. (You do not need to cook them completely as they will cook with the rice later.) Remove the pan from the heat.
Transfer the dried rice to a pot (or rice cooker) and pour in the dashi liquid from the shiitake and kombu. Empty the contents of the frying pan on top of the rice.Finally, pour 3 tbsp Japanese soy sauce (koikuchi shoyu), 2 tbsp mirin and 2 tbsp sake and ¼ tsp dashi granules into the pot. IMPORTANT: Do not mix! If using a rice cooker, close the lid and set it on a regular setting. If using a pot on the stove, see next step.
Place the pot onto the stove with the lid on and bring it to a boil over a medium heat. (Listen carefully and try to refrain from removing the lid.) Once you can hear it boiling, set a timer for 2 minutes.After two minutes, reduce the heat to medium low and set a timer for 3 minutes. Turn the heat right down to the lowest setting and set a timer for 5 minutes. Blast the heat for 10 seconds on the highest setting and then turn it off. Leave the rice pot on the warm stove and allow to steam for 20 minutes.
After 20 minutes of steaming, remove the lid and mix the rice thoroughly.
Serve with a sprinkle of finely chopped green onions and enjoy!
Notes
Leftovers should be frozen (not refrigerated) and then thoroughly reheated in the microwave before eating.