Lightly roll out the puff pastry and spread mustard on top.
Arrange ham, sliced cheese, prosciutto and sliced cheddar on top, overlapping each item 2 centimeters apart.
Brush pastry with beaten egg and roll up tightly.
Slice the roll into 2 centimeters pieces.
Push a wooden skewer through each piece and brush the outside of each piece with beaten egg.
Bake for 25 minutes at 200 degrees C.
Sprinkle with chopped parsley before serving.