A great soup that will keep the whole family happy as the nights get cooler - roasted butternut squash, onions and garlic to warm you inside.
Preheat the oven to gas 6, 200°C, fan 180°C. Put the squash in a large roasting tin, toss together with 3 tbsp oil, season, then roast in the preheated oven, turning once during cooking, for 30-40 minutes, until golden and soft.
Meanwhile, heat the remaining 1 tbsp oil with the butter in a large saucepan. Add the onions and cook over a low heat for 10-15 minutes until really soft. Add the garlic and cook for 2 minutes more.
Tip the cooked squash into the pan along with the stock and leave to bubble for a minute or two. Use a stick blender to carefully whizz the soup until smooth. Stir through 4 tbsp of sour cream, then ladle into mugs or bowls and swirl over the remaining sour cream to serve.
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