Turn the grill to high, put the pittas on
the grill rack and heat for about a minute
while you slice the mozzarella into five.
Turn the pittas over and spread each
one with 1 tsp pesto, then top with a
mozzarella slice. Pile the ham on top, so it
looks quite ruffled, then tear the final
mozzarella slice into four, put it on top of
the ham and grind over black pepper.
Return to the grill for 3-4 minutes more
until melted and starting to turn golden.