Grilled Tomato Sandwich and Cheese Soup

Name: Grilled Tomato Sandwich and Cheese Soup
Ingredients: FOR THE CHEESE SOUP; 1 tablespoon extra virgin olive oil; 1 tablespoon butter; 2 leeks, white and light green parts only, thinly sliced and washed; 2 celery stalks, diced; 3 garlic cloves, minced; 2 medium turnips, peeled and diced into small pieces; 1 tablespoon all-purpose flour; 4 cups vegetable stock; 1/2 cup heavy cream; 1/4 teaspoon ground nutmeg; Diamond Crystal kosher salt and freshly ground black pepper, to taste; 1 teaspoon Italian seasoning; 16 ounces sharp white cheddar cheese, shredded; FOR THE TOMATO SANDWICHES; 6 ciabatta rolls; 2 large tomatoes, sliced; 4 ounces ‘Nduja (spreadable Italian sausage); butter, for greasing the pan