Recipe ingredients : 600g beef fillet 25g butter 1 onion, thinly sliced 250g button mushrooms, thinly sliced 1 tbsp dijon mustard 400ml beef stock 1 tbsp vegetable oil 2 heaped tbsp soured cream or crème fraiche 1 tbsp (or more) brandy (optional) squeeze of lemon (optional) finely chopped parsley, to serve flaked sea salt freshly ground black pepp
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