Preheat oven to 200°C. Place the combined pumpkins in a roasting pan. Drizzle olive oil over pumpkin and season with salt and pepper. Bake in oven for 45 minutes or until tender.
Combine pistachios, spring onions and parsley in a bowl. Sprinkle over pumpkin and toss to combine. Serve warm as a side dish.
Tip: Use any type of pumpkin that is in season and available at your green grocers.