Make su-meshi. Place fresh tuna, avocado, seaweed and any Japanese herbs you like on the sumeshi. That's all.
Drizzle soy sauce and Wasabi when serve.
Here's "Sushi-zu" recipe.
Ingredients
1 cup of rice vinegar( I prefer "千鳥酢”)
5 tablespoon beet sugar
1 teaspoon salt
Pour them into a bin. Put the cap on the bin. Shake it. It can be stored for 1month.
Besides making sumeshi, you can use it for Japanese style salad and marinated fish as well.
Of course, Taro was not interested in it at all.
Hope he will get over soon.