Chicken Caesar Soup

Ingredients (18)

• 1 romaine heart, cut in half lengthwise
• 3 tablespoons extra virgin olive oil, divided
• 2 tablespoons unsalted butter
• 1-1/2 cups chopped onion
• 4 garlic cloves, minced
• 2 teaspoons Dijon mustard
• 1-1/2 teaspoons anchovy paste
• 1 teaspoon Worcestershire sauce
• 1-1/2 teaspoons pepper
• 1 teaspoon salt
• 1-1/2 pounds medium Yukon Gold potatoes, peeled and chopped
• 4 cups chicken stock
• 1/2 cup heavy whipping cream
• 1 cup grated Parmesan cheese plus more for garnish
• 3 tablespoons fresh lemon juice
• 1 pound rotisserie chicken, chopped or shredded
• 1 cup Caesar salad croutons, for garnish
• Freshly cracked black pepper, for garnish