Kale and Cannellini Soup

Name: Kale and Cannellini Soup
Ingredients: 1 tablespoon extra-virgin olive oil; 1 medium carrot, chopped; 1/2 cup chopped celery; 4 cups cooking liquid from Cannellini Beans with Kale (click for recipe); 3 1/2 cups Cannellini Beans with Kale (click for recipe); 1 cup diced Italian tomatoes in juice; 3 tablespoons grated Parmesan cheese plus additional (for serving); 2 garlic cloves, minced; 1 1/4 teaspoons Italian seasoning; 8 1/2-inch-thick slices baguette, toasted; Truffle oil (for drizzling)