Caramelized Onion Tart

Ingredients

• 2 tablespoons olive oil 
• 0.5 cup parmesan cheese shredded
• 17.3 ounce puff pastry sheets frozen thawed
• 6 servings garnish: rosemary sprigs fresh
• 1 teaspoon salt 
• 3 pounds onions sweet sliced

Equipment

• frying pan
• oven
• tart form

Directions

1. Cook onion in hot oil in a large skillet over low heat, stirring often, 30 to 35 minutes or until onion is caramel colored. Stir in salt, and set mixture aside.
2. Unfold pastry sheet; fit into a 9-inch square tart pan.
3. Bake at 400 for 15 to 20 minutes or until browned.
4. Remove from oven. Press pastry with the back of a spoon to flatten. Top with caramelized onion; sprinkle with Parmesan cheese.
5. Bake 5 more minutes.
6. Garnish, if desired.