Root Vegetable Soup With Lentils And Gruyère

Name: Root Vegetable Soup With Lentils And Gruyère
Ingredients: 1/2 cup green lentils; Salt; 1/4 pound pancetta, sliced 1/4 inch thick and finely diced; 6 garlic cloves, minced; 2 carrots, finely diced; 2 celery ribs, finely diced; 1 onion, finely diced; 1 medium red potato, finely diced; 1/2 cup finely diced peeled celery root; 1/2 cup finely diced peeled butternut squash; 1/2 finely diced peeled rutabaga; 1 bay leaf; Freshly ground pepper; 2 1/2 quarts chicken stock or canned low-sodium broth; 2 tablespoons chopped parsley; 1 tablespoon chopped thyme; 1/4 pound Gruyère, thinly shaved