Set the oven to 200C.

Melt butter at low heat

Stir in the flour and mix well until a dough starts to form

Gradually pour in the milk, mixing really well so that there are no lumps in the sauce

Once all the milk has been added, add the grated cheeses and a pinch of nutmeg, pepper and salt

Mix well until you get a thick cheese sauce

Add the finely cubed ham to the sauce

Allow the mixture to cool

Roll out the pastry and cut each sheet into squares

Put a scoop of the cheese mixture in the centre of each square.

Fold the corners to the centre and make sure they overlap (to avoid the ham and cheese from pouring out of the pastry). Pinch together the edges where needed

Brush the egg mix over the pastry and sprinkle the final bit of cheese on top, and repeat for the other squares.

Place on baking paper in an oven tray and bake at 200°C for 15-20 minutes or until golden-brown.

If you had spillage with one of the jambons cracking open then simply scoop the contents back in and fold the pastry close again. It happens to the best of us 😉