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" Ingredients 500g/1lb 2oz sweet potatoes, peeled and roughly chopped 1 red onion, chopped 2 tbsp olive oil 2 tsp ground cumin 1litre/1\u00BE pints vegetable stock 1 tbsp tomato pur\u00E9e 4 tbsp natural yogurt, to serve Method 1. Preheat oven to gas mark 7/220\u00B0C (200\u00B0C) in a fan oven. Put potatoes and red onion in a roasting tin and drizzle over olive oil. Sprinkle with cumin and plenty of salt and freshly ground black pepper. Roast potatoes and onion for 20 mins, till tender and golden. 2. Blend potatoes and onion with hot stock and tomato pur\u00E9e in batches till smooth. Put in a pan and warm through to serve. Add a dollop of yogurt on top. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.prima.co.uk/all-recipes/healthy-recipes/a15977/sweet-potato-soup/>