Maguro zuke don is a delicious rice bowl dish made with fresh raw tuna soaked in a rich soy based marinade. Not only is it mouthwatering, but it's extremely simple to make and requires barely any cooking!
Pour the sauce into a wide container and allow to cool to room temperature. (Speed up the process by placing the container over ice or cold water.) Once cooled, add a piece of kombu.
Dip the tuna pieces in the marinade to coat both sides and then lay them flat in the container. Cover with plastic wrap and marinate in the fridge for 30 minutes.
Divide the rice into bowls and then arrange the tuna on top. Drizzle with 1/2 tbsp of leftover marinade and top with shredded perilla leaves, wasabi and an egg yolk. Enjoy!