Cube tuna or kindly ask seafood guy [or lady] to do it- see above KISS Tip. Combine Tamari and black pepper and pour over tuna in medium glass bowl Stir and make sure tuna is evenly coated with marinade.. Marinate in fridge for about 30 minutes.
While tuna is marinating, chop mango, cucumber, avocado and asparagus.
Add avocado oil to a small skillet and sauté asparagus and garlic for 3-4 minutes until slightly softened.
Heat rice per package instructions and prepare spicy mayo.
Build bowls by dividing heated rice on bottom of each bowl. Evenly divide cucumber, avocado, mango, asparagus and place in bowl on top of rice. Spoon marinated tuna in the middle and add chives, toasted sesame seeds and spicy mayo drizzle, if desired. Enjoy and make often :).