These are not easy to get right – they've been practising for centuries in Portugal – but follow the instructions carefully and they'll work. Prep time: 25 minutes | Cooking time: 50 minutes 28 We rely on advertising to help fund our award-winning journalism.We urge you to turn off your ad blocker for The Telegraph website so that you can continue to access our quality content in the future.Thank you for your support.Need help?Visit our page..
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