01 -
2 sheets puff pastry (320g each).
02 -
1 tablespoon Dijon mustard.
03 -
12 slices wafer thin ham.
04 -
150g cheddar cheese, finely grated.
05 -
1 egg, beaten.
06 -
Grated parmesan for serving.
07 -
1 tablespoon butter (for sauce).
08 -
1 tablespoon plain flour (for sauce).
09 -
240ml milk (for sauce).
10 -
60g gruyere cheese, grated (for sauce).
11 -
⅛ teaspoon each salt, white pepper, nutmeg (for sauce).