Cook sushi rice according to package instructions and allow it to cool slightly.

In a bowl, combine drained tuna, mayonnaise, chopped green onions, sesame oil, and soy sauce until well mixed.

With wet hands, shape warm sushi rice into round patties about an inch thick.

On one rice bun patty, layer tuna mixture followed by avocado slices, lettuce leaves, and tomato slices. Top with another rice bun.

Plate your burgers immediately and enjoy fresh!