Step 1

Heat the oil in a large frying pan over high heat. Cook the steaks, turning, for 3-4 minutes or until just browned all over. Transfer to a plate and place in the fridge until cooled slightly.

Step 2

Reduce heat to medium. Add mushrooms, shallot and garlic to pan. Cook, stirring, for 15 minutes or until golden and liquid has evaporated. Transfer to a plate. Place in fridge for 5 minutes or until cooled slightly.

Step 3

Lay 6 prosciutto slices on a sheet of plastic wrap, overlapping slightly, to make a rectangle. Spread over mushie mixture, leaving a thin border. Place steaks lengthways on top of rectangle. Spread steaks with mustard. Fold prosciutto over the steaks. Lay remaining prosciutto slice on top lengthways to cover any gaps. Tuck in ends. Wrap firmly in plastic wrap. Place in the fridge for 20 minutes to chill.

Step 4

Lay the pastry on a flat surface. Unwrap the log and place centred on pastry. Fold over pastry to enclose, tucking in ends to seal. Place, seam-side down, on a piece of baking paper. Brush the top with egg and use a knife to score the pastry diagonally.

Step 5

Place in air fryer basket. Cook at 180C for 20 minutes for medium rare or until cooked to your liking. Serve with broccolini and relish.