50 g/2 oz/0.25 cup butter or margarine
2 onions, chopped
100 g/4 oz mushrooms, sliced
15 ml/1 tbsp plain (all-purpose) flour
Salt and freshly ground black pepper
750 g/1.75 lb fillet steak, cut into strips
300 ml/0.5 pt/1.5 cups Beef Stock
5 ml/1 tsp dried mixed herbs
15 ml/1 tbsp tomato puree (paste)
10 ml/2 tsp French mustard
150 ml/0.25 pt soured (dairy sour) cream
15 ml/1 tbsp chopped parsley
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