Prepare a baking tray.
Spread the Japanese rice mixture on one half of the tray.
Spread the cauliflower rice mixture on the other half.
Keep both sides separate.
Sprinkle some roasted sesame seeds and shredded roasted seaweed over both rice bases.
Drizzle with mayonnaise and sriracha.
Spread the seafood topping evenly over both sides.
Add another layer of: Roasted sesame seeds, Roasted seaweed, Mayonnaise, Sriracha