Preheat oven to 350° F. Cut each onion into 6 wedges, leaving root end intact. Combine onions, oil, salt and pepper in a bowl; toss well. Place in a large casserole dish. Cover and bake for 45 minutes. Uncover and bake an additional hour, or until onions are caramelized. Let cool.
Preheat oven to 500° F. Prepare pizza crust as indicated on package. Separate into three individual crusts.
Spread about 1 tablespoon il Giardino® Mascarpone cheese over each prepared pizza crust. Top each crust with 1/3 of the caramelized onions. Sprinkle about 2 tablespoons Gorgonzola cheese and 1 tablespoon pecans over each pizza.
Bake at 500° F for 8 minutes, or until crusts are crisp and cheese melts.