01 -
Heat your oven up to 400°F to get it ready.
02 -
Sear all sides of the beef after seasoning.
03 -
Let the beef cool off first, then brush mustard over it.
04 -
Blend the mushrooms and cook them thoroughly until there's no moisture left.
05 -
Spread mushrooms and prosciutto, then wrap the beef snugly inside.
06 -
Pop the wrapped beef in the fridge for about 20 minutes.
07 -
Cover the beef with the puff pastry and seal it using egg wash.
08 -
Make faint cuts on the pastry and sprinkle flaky salt on top.
09 -
Cook it for 25-35 minutes till the outside turns golden.