Caramelized Onion Pizza with Gorgonzola and Arugula

INGREDIENTS

• 2 teaspoons olive oil
• 12 cups thinly sliced onion (about 3 pounds)
• 2 teaspoons chopped fresh or 1/2 teaspoon dried rosemary, divided
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1/2 recipe Whole-Wheat Pizza Dough
• Cooking spray
• 1 tablespoon yellow cornmeal
• 1/2 cup (2 ounces) crumbled Gorgonzola, blue cheese, or feta
• 2 tablespoons coarsely chopped walnuts
• 1 cup trimmed arugula