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Gently fry onions for 5 mins in oil, until softened. Tip in beans, tomatoes and seasoning, then simmer for 10 mins, stirring occasionally.
Meanwhile, warm the wraps in the microwave on High for 1 min.
Take a large spoonful of beans and spoon along the centre of each wrap. Top with some grated cheese, a spoonful of guacamole and soured cream and a sprinkling of coriander or parsley. Wrap into a cigar shape and eat straight away.