Cook the sushi rice

• Rinse the sushi rice until the water runs clear.
• Simmer the rice with the water, covered, until tender.
• Stir in the rice vinegar, sugar and salt, then let the rice cool slightly.

Make the spicy tuna topping

• Flake the drained tuna into a bowl.
• Mix with the mayonnaise, sriracha and spring onion.

Shape the rice bases

• Press the seasoned rice into flat, pizza-like rounds on a tray.
• Chill the rounds so they hold their shape.

Coat and fry the bases

• Brush the rice rounds with the beaten egg and coat them with panko breadcrumbs.
• Heat the vegetable oil and fry the bases until golden and crunchy on both sides.
• Drain on paper towel.

Assemble the sushi pizza

• Lay the nori on the fried rice bases.
• Spread the spicy tuna mixture over the top.
• Top with avocado, cucumber and toasted sesame seeds.
• Drizzle with soy sauce and serve.