Preheat the oven to 200°C.
Cut the pear in half lengthways. Remove the core with a teaspoon or melon baller. Place the pear halves on their flat side and cut them into thin slices. Cut the red onion into rings.
Thinly roll out the pizza dough on a floured worktop into a round piece measuring approximately 30 cm. Cover it with crème fraîche. Keep 1.5 cm clear of the edge.
Divide the slices of ham, pear, gorgonzola and the pine nuts across the pizza.
Bake the pizza in the oven for 20 minutes.
Cover the baked pizza with the arugula and cut into slices.