50 g/2 oz/0.25 cup butter or margarine
1 onion, sliced
100 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 strips
150 ml/0.25 pt soured (dairy sour) cream
30 ml/2 tbsp lemon juice
Salt and freshly ground black pepper
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