Preheat the oven to 200°C (390°F). Line a baking tray with parchment paper.
Cut the Hokkaido pumpkin into halves and remove the seeds. Then slice into wedges and place on the baking tray.
Cut the potato and carrots into chunks. Peel and quarter the red onions. Place all vegetables including the whole head of garlic (top cut off) on the tray.
Drizzle with olive oil and season with salt.
Roast for 35-40 minutes until vegetables are tender and caramelized.
Remove and cool slightly. Squeeze roasted garlic from skin into a blender.
Add roasted pumpkin, potato, carrots, onions, ginger, coconut milk, and vegetable broth.
Blend until smooth and creamy. Adjust seasoning with coriander, pepper, and chili flakes.
Heat the blended mixture in a saucepan over medium heat until warmed through.
Serve hot, drizzled with pumpkin oil if desired. Enjoy with toasted bread or pumpkin seeds.