Step 1Preheat oven to 240°C. Line 3 baking trays with baking paper. Place pizza bases on 2 of the prepared baking trays.
Step 2Place pumpkin slices, in a single layer, on remaining tray. Spray pumpkin with oil and bake for 15-20 minutes or until tender and golden.
Step 3Meanwhile, set a large non-stick frying pan over a medium heat and spray with oil. Cook onions, stirring, for 10-15 minutes or until golden and caramelised.
Step 4Spread tomato paste on pizza bases then top with roasted pumpkin, onions and prawns. Bake for 8-10 minutes or until prawns are pink and cooked through.
Step 5Combine yoghurt and 2 tablespoons water in a small bowl. Drizzle pizzas with yoghurt mixture then scatter with half of the coriander.
Step 6Place cucumbers, salad greens and remaining coriander in a medium-sized salad bowl. Toss lightly. Serve pizza slices with salad.