Place the diced avocado in a mixing bowl. Add half the lime juice, diced tomato, red onion, salt and a dash of toasted sesame oil and mix gently. Ensure that some of the avocado remains chunky.

Place the ring mould on your serving plate. Spoon half of the avocado mixture inside the mould, pressing down and smoothing with the back of a spoon. Next, add a can of soy and ginger infused tuna and again press down and smooth with the back of a spoon. Cover the top surface with half of the toasted sesame seeds.

Gently press down on the top layer while slowly removing the mould to reveal the tuna stack. Repeat the layering process with the remaining ingredients to form a second tuna stack.Finish each stack with a sprig of coriander, a small dash of sesame oil and the remaining lime juice. Serve immediately.