Rub the tuna with oil and season with salt and pepper. Sear it in a super hot oiled frying pan for 2 minutes on each side. Rest for 4 minutes, then thinly slice. Divide rice between two bowls then top each one with equal portions of the toppings – cucumber, edamame, avocado slices, etc. To make the super simple, yummy dressing, mix the mayo and sesame oil with enough water to thin it out to pouring consistency. Drizzle sauce generously over each poke bowl and enjoy.