Preheat oven to 220C/200C fan-forced. Place pumpkin, oil and seasoning in a bowl. Toss to coat. Transfer to a baking tray lined with baking paper. Roast for 20 to 25 minutes, turning once, or until golden and tender.
Meanwhile, place quinoa and 1 1/2 cups cold water in a saucepan over high heat. Cover. Bring to the boil. Reduce heat to low. Simmer for 10 to 12 minutes or until liquid is absorbed.
Place quinoa in a heatproof bowl. Add pumpkin, lemon juice, preserved lemon and coriander. Season with salt and pepper. Toss gently to combine. Serve.