Nattō Gohan

Rinse 150 grams of Japanese short-grain rice thoroughly under cold running water until the water runs clear.

Combine the rinsed Japanese short-grain rice with 200 grams of water in a rice cooker and cook according to the appliance's instructions.

Open the 50 grams of nattō and transfer it to a small bowl. Add the accompanying 5 grams of nattō sauce packet, 1 gram of karashi mustard, and 5 grams of soy sauce (koikuchi).