Cook the sushi rice

• Rinse the sushi rice and cook it with the water until tender and the water is absorbed.
• Stir the rice vinegar, sugar and salt together, then fold into the warm rice and let it cool slightly.

Build the sandwich

• Lay a nori sheet on a piece of wrap or a bamboo mat and spread the rice evenly over it.
• Arrange the salmon, cream cheese, cucumber and avocado in the center, then fold the nori over to form a square sandwich.
• Wrap tightly and press to seal, then repeat with the second nori sheet.

Coat the sandwich

• Brush the outside of the wrapped sandwich with a little water and sprinkle with sesame seeds.
• Dredge it in the flour, then dip in the beaten egg and coat generously with panko breadcrumbs.

Fry until golden

• Heat the vegetable oil in a pan to about 170 °C.
• Fry the sandwich on each side until deep golden and crisp, then drain on paper towels.

Slice and serve

• Cut the fried sandwich into halves or thick slices with a sharp knife.
• Serve immediately with soy sauce for dipping.