Caramelized Onion Pizza

Summary
Yields: 4 servings
Difficulty: Moderate
Prep Time: 35 minutes
Cook Time: 20 minutes
Recipe courtesy of: Diep Dao
Rating: 4 stars
Cost: $15

Ingredients
2 Tbsp butter
2 Tbsp of extra-virgin olive oil, plus some for drizzling
2 large onions, thinly sliced
Salt and freshly ground pepper
1 pizza dough, from your favorite pizza shop or store-bought
1/4 lb sliced prosciutto, cut into strips
1 cup grated fontina cheese
1/4 pound gorgonzola cheese, crumbled into small pieces
4 Tbsp chopped sage
1/2 cup crushed walnuts
1 tsp. sugar
