Smoky sweet potato soup

_ Ingredients onion 1, roughly chopped butter ground coriander 1 tsp hot smoked paprika 1 tsp sweet potato 750g, peeled and cut into chunks garlic 2 cloves, crushed gruyère cheese or veggie alternative ) 75g, grated vegetable stock 1 litre _ Method Melt a knob of butter in a large pan, add the onion, paprika, coriander and garlic and cook for about 8 minutes until softened.Add the sweet potato and cook for a few more minutes.Add the stock, bring to the boil then simmer, covered, for 10 minutes, or until the veg is soft. Whizz in a blender or with a stick blender to a smooth soup. Season and serve with a sprinkling of cheese and an extra pinch of paprika, if you like.