Pesto Pasta Salad

INGREDIENTS

• 8 ounces, weight Short Fusilli Or Rotini (corkscrew) Pasta
• 1/3 cup Prepared Pesto
• 1/2 cup Shredded Parmesan Cheese
• 1/2 cup Mayonnaise
• 1/2 cup Sour Cream
• 1/4 cup Milk, More For Thinning
• 1/2 teaspoon Salt
• 1/2 teaspoon Pepper
• 1 head (large) Romaine Lettuce, Sliced Into 1-inch Pieces
• 1 cup Grape Tomatoes, Halved
• 1/2 cup Black Or Kalamata Olives, Halved
• 4 ounces, weight Mozzarella Cheese, Cut Into Cubes
• 4 Tablespoons Pine Nuts (optional)
• 8 Extra Parmesan, For Sprinkling