Combine the drained tuna, chopped green onions, egg, soy sauce, arrowroot powder, mayonnaise, minced garlic, salt, and pepper in a mixing bowl and stir until well combined.

Shape the mixture into approximately 2-inch patties and place on a plate.

Heat avocado oil and sesame oil in a nonstick skillet over medium heat until hot.

Fry the patties for about 2 minutes on one side until golden brown, then flip and cook for an additional 2 minutes.

Whisk together remaining mayonnaise, lime juice, sriracha, and a pinch of salt and pepper in a small bowl until smooth.

Remove the tuna cakes from the skillet, serve with the spicy mayo, and enjoy!