Coat the salmon in sake in a bowl and set aside. This step is optional but important if you want to get rid of the fishy smell of the salmon.
Pour 2 cups of rice into rice cooker bowl
Rinse rice under water and pour out the water. Repeat this step 4-5 times until the water is more transparent. In the first wash, the water is opaque. The water will not be translucent but should be significantly clearer than the first rinse.
Pour filtered water up to the 2 line mark on the rice cooker. If your rice cooker does not have this, it is 1:1 ratio of rice to water (2 rice cooker cups or about 1.5 measuring cups of water)
Remove 3 tbsp of water from the rice cooker. This will prevent the rice from becoming too soft as water and juice will expell from salmon.
Remove salmon from sake and put salmon in the rice. Discard the sake.
Cook rice as usual in a regular cooking setting. My rice cooker cooks for 55 minutes.
Once rice is done, mix salmon into the rice
Mix in the other ingredients: soy sauce, dashi powder, sugar, furikake, sesame oil, and green onion. The order does not matter, but make sure it is fully incorporated.
Give it a taste test and adjust flavor if needed. You can add more salt here as well.
Once the flavors are to your liking, mold onigiri into onigiri
I am using an onigiri mold in this recipe; however, you can also shape the rice with your hands. (I linked this 6 onigiri mold above)
Wrap nori from one side of the onigiri to the other. You can cover the entire onigiri in nori if you like or a small portion like I did here.
Serve and enjoy!