Cook the sushi rice

• Rinse the sushi rice until the water runs clear.
• Cook the rice, then season with the rice vinegar and let it cool slightly.

Make the teriyaki sauce

• Combine the soy sauce, mirin and brown sugar in a saucepan.
• Simmer until the sugar dissolves and the sauce thickens slightly.

Cook the prawns

• Toss the prawns with the cornflour.
• Fry the prawns in the vegetable oil until golden, then coat with the teriyaki sauce.

Cook the crispy rice waffles

• Press the seasoned rice into a hot, lightly oiled waffle iron.
• Cook until golden and crisp on both sides.

Assemble and serve

• Top each rice waffle with the teriyaki prawns and sliced avocado.
• Finish with sesame oil, spring onion and toasted sesame seeds.