Prepare Ingredients: Wash and finely chop the green onions, separating the white parts from the greens. Set the greens aside for garnish. Add the crumbs to a small bowl and set aside.
Make the Spicy Mayo: In a small bowl, whisk together the mayonnaise, lime juice, sriracha sauce, and a pinch of salt and pepper. Taste and adjust as desired. Set aside.
Mix the Tuna Cakes: In a mixing bowl, combine the drained tuna, the whites of the green onions, the egg, soy sauce, arrowroot powder, remaining mayonnaise, minced garlic, salt, and pepper. Use a fork to mix thoroughly until the mixture is completely combined.
Form and Coat the Tuna Cakes: Take small portions of the tuna mixture and form them into cakes, approximately 2 inches in diameter. Coat each cake evenly in the panko crumbs to create a crisp exterior.
Cook the Tuna Cakes: Heat a nonstick pan over medium heat. Drizzle in a little avocado oil and sesame oil. Once heated, add the tuna cakes and fry for about 2 minutes on each side or until golden brown and heated through.
Serve: Transfer the cooked tuna cakes to a plate. Drizzle with spicy mayo and garnish with sesame seeds and the reserved green onion greens. Enjoy!