Let frozen puff pastry stand at room temperature for 20 minutes to thaw.

Line baking sheets with parchment or plain brown paper.

In a small bowl, stir together the honey and Dijon mustard.

Set the baking sheets and the honey mixture aside.

On a lightly floured surface, unfold 1 sheet of pastry.

Spread with half the honey-mustard mixture.

Sprinkle with half the grated Parmesan or Romano cheese.

Top with half the thinly sliced ham.

Starting at one long edge, roll pastry, jelly roll style, to the opposite center.

Repeat from the opposite edge, forming 2 rolls that meet in the center.

With a sharp knife, cut the pastry roll crosswise into 1/2" thick slices.

If the roll is too soft to slice easily, chill for a few minutes.

Arrange the slices 2" apart on prepared baking sheets.

Repeat with remaining pastry.

Combine egg and water.

Brush the egg wash onto pastries.

Bake pastries in a 400 degree oven for 15-18 minutes or until golden and crisp.

Remove from baking sheets.

Cool on wire rack.

Serve warm or at room temperature.