In a bowl, combine the cooked sushi rice, cornstarch, sesame oil, The Holly Tree Organic Peri Peri Seasoning, The Holly Tree Organic Black Pepper Powder, and The Holly Tree 100% Natural Himalayan Pink Salt. Mix until well combined.
Press the rice firmly into a parchment-lined square dish to about 1 inch thick. Refrigerate for 30 minutes until firm.
Cut the chilled rice into squares or rectangles.
Heat the neutral oil in a non-stick skillet over medium heat.
Pan-fry the rice cakes for 3–4 minutes per side until golden brown and crispy on the outside while remaining soft inside.
In a small bowl, whisk together the Greek yogurt, The Holly Tree Organic Peri Peri Seasoning, lemon juice, and olive oil.
Arrange the crispy rice cakes on a serving plate. Top each with avocado slices and cucumber ribbons.
Drizzle generously with the peri peri yogurt sauce, then garnish with pickled red onions, sesame seeds, and chopped spring onions.