Drain the oil from the canned tuna thoroughly, fluff it up, and place it in a bowl.

Tuna Mayo Rice Bowl
An ultimate Tuna Mayo Rice Bowl recipe that even someone living alone can easily make, utilizing the secrets of local Japanese specialty restaurants.
What You'll Need
Instructions
Mix the canned tuna with an equal amount of mayonnaise in a 1:1 ratio until smooth.
Add 1/2 tsp of Hondashi, a seasoning made from blue-backed fish, to the tuna and mayonnaise mixture to enhance the umami.
Add minced onion and finely chopped green onion to taste.
Stack the perilla leaves, roll them up, and slice into thin strips.
Sprinkle 1/2 tsp of chicken powder (or chicken stock) over 220g of warm rice and mix to add seasoning and flavor.
Divide the rice mixed with chicken powder into four sections, lift and flip each portion, and gently break it up so that each grain of rice remains distinct.
Place the prepared rice in a bowl and top generously with the thinly sliced perilla leaves.
Top the rice with a generous amount of the prepared tuna mayo.
Enjoy with soy sauce, dried seaweed flakes, sesame seeds, or wasabi according to your preference.