Step 1: Prepare the Crispy Rice

1. In a bowl, combine the rice wine vinegar, sugar, and salt, stirring until fully dissolved.
2. Gently mix this seasoning into the warm sushi rice, folding carefully to avoid mashing.
3. Shape the rice into small, firm patties (about the size of slider buns).
4. Heat a generous amount of neutral oil in a frying pan over medium-high heat.
5. Fry each rice patty until golden brown and crispy on both sides.

Step 2: Prepare the Filling

1. In a bowl, mix the diced fatty tuna with lime juice, chopped green onion, and masago if desired. Set aside.
2. Thinly slice the avocado and season with kosher salt.

Step 3: Make the Wasabi Soy Drizzle

1. In a small bowl, whisk together the soy sauce, lime juice, honey, and wasabi until smooth and combined.

Step 4: Assemble the Sliders

1. Take one crispy rice patty as the base.
2. Layer a few slices of avocado and a spoonful of the tuna mixture on top.
3. Drizzle lightly with the wasabi soy sauce.
4. Top with a second crispy rice patty to complete the slider.