Tie the beef fillet into a nice round shape. Season it with thyme, rosemary and salt.
Preheat oven to 200C.
Fry the fillet on a hot pan on all sides for 1 minute.
Put the fillet into oven and cook for 20 minutes.
Prepare mayo. Put mustard and egg yolk into mixing bowl, add salt and pepper, stirr it, then add yoghurt and stirr properly. Put the mayonnaise into cool place.
Take beef fillet out of the oven and cover it with folio for 5 minutes.
Cut 1cm pieces of meet and enjoy with Chive mayonnaise!
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