Caramelized onion grilled pizza recipe

Ingredients

• 4 teaspoons olive oil
• 3 yellow onions, thinly sliced
• 1/4 teaspoon salt
• 1/4 teaspoon black pepper
• 1 1/2 teaspoons balsamic vinegar
• 1 pound refrigerated pizza dough, divided into four pieces
• 6 ounces blue cheese, crumbled
• 4 teaspoons chopped fresh rosemary