Warming sweet potato and ginger soup

Method

1. Heat the oven to 200°C/180°C fan/gas 6. Spread the sweet potato pieces and apple wedges in a large roasting tray, drizzle with olive oil and season with salt and pepper. Roast for 40-45 minutes until softened and golden.
2. Meanwhile, in a large saucepan, heat the coconut oil. Add the onion and fry over a low-medium heat for 5 minutes. Add the coriander and cumin seeds, then fry for a further 5-10 minutes until fragrant.
3. Add the ginger, coconut milk, stock and salt, then bring to a gentle simmer. Once the sweet potato and apple are cooked, carefully add them to the pan. Simmer for a further 5 minutes, then remove from the heat. Use a stick blender to whizz the soup until smooth – wrap a tea towel around the pan to prevent the soup from splashing while you whizz it. (Or carefully blend in batches in a jug blender.)
4. Serve with a swirl of yogurt and a sprinkling of coriander. Have some crusty bread on hand for dunking.