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      50 g/2 oz/0.25 cup butter or margarine 
      1 onion, sliced100 g/4 oz button mushrooms, sliced
 
      30 ml/2 tbsp tomato puree (paste) 
      15 ml/1 tbsp plain (all-purpose) flour 
      4 veal escalope, flattened and cut into strips150 ml/0.25 pt soured (dairy sour) cream
 30 ml/2 tbsp lemon juice
 Salt and freshly ground black pepper
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