01 - 
                Preheat oven to 400°F.
              
              
              
                02 - 
                Season and sear beef on all sides.
              
              
              
                03 - 
                Cool beef, then coat with mustard.
              
              
              
                04 - 
                Process mushrooms and cook them until dry.
              
              
              
                05 - 
                Layer ham and mushrooms, then wrap beef within.
              
              
              
                06 - 
                Chill the wrapped beef for 20 minutes.
              
              
              
                07 - 
                Wrap the beef in puff pastry and seal with egg wash.
              
              
              
                08 - 
                Score the puff pastry and sprinkle with flaky salt.
              
              
              
                09 - 
                Bake for 25-35 minutes until golden brown.