For the Spicy Mayonnaise: combine ingredients in a small mixing bowl then set aside.
Add tuna to another small mixing bowl then add ¼ cup spicy mayonnaise (or more or less) and mix to combine.
Scoop cooked rice into two bowls then divide tuna mixture between them. Top with remaining ingredients then drizzle bowls with gluten free Tamari and more spicy mayonnaise, and then sprinkle with sesame seeds before serving.
