Pear, Gorgonzola and Hazelnut Pizza with Mixed Greens

Pizza dough; homemade or store bought

Olive oil

Mozzarella Cheese, divided

medium onion, sliced

pears, cored and sliced

Fresh greens; I used a combination of Romaine and Radicchio; mixed greens would be nice too.

hazelnuts, toasted

crumbled Gorgonzola cheese

For the Dressing::

mayonnaise

buttermilk (I never buy buttermilk, simply add the juice of one lemon to regular milk and let it sit for a few minutes until it thickens)

sour cream

Gorgonzola cheese