Cut the avocado and tuna into bite-sized chunks.
Combine the listed ingredients from the nameko mushrooms to the wasabi. Pour the mixture on top of the avocado and tuna.
This is exactly what the dish looks like when you order it in a restaurant.
It's also great with thinly sliced cucumber.
Story Behind this Recipe
I rearranged a menu on the item at my favorite Japanese pub by adding some vinegar. The pub used "nameko mushroom soy sauce" but I used an easier way and just used regular nameko mushrooms and seasoned with condiments.
Cut the avocado right before you're going to eat this. Brands of nameko mushrooms differ in taste, so adjust the taste accordingly.