3 tbsp chopped fresh flatleaf parsley
1 tbsp wholegrain mustard
salt and freshly ground black pepper
4 tsp sunflower or vegetable oil
250g/9oz crème fraîche
400–450²µ/14´Ç³ú–1±ô²ú pork fillet
freshly cooked rice, jacket or mashed potatoes, or skinny fries, to serve