1. Put the butternut squash on a baking tray, drizzle 2 tbsp olive oil over and season with salt and pepper.
2. Roast the squash until charred and soft, about 30 minutes. Scrape away the flesh and set aside.
3. In a large saucepan, fry the leeks, fresh ginger and thyme in 1 tbsp olive oil for about 5 minutes. Season to taste.
4. Pour in 700ml good chicken stock. Tip in the flesh of the roasted squash and bring to the boil.
5. Taste for seasoning and puree in a food processor.