3 tablespoons olive oil
2 ounces chopped pancetta (about 1/2 cup)
2 1/2 pounds short ribs
Salt
Freshly ground black pepper
1/4 cup all-purpose flour
1 medium onion, chopped
1 carrot, chopped
1/2 cup fresh parsley leaves
2 cloves garlic
1 (14-ounce) can tomatoes (whole or diced)
1 tablespoon tomato paste
1 teaspoon chopped fresh rosemary leaves
1 teaspoon dried thyme
1/2 teaspoon dried oregano
1 bay leaf
2 1/2 cups beef broth
3/4 cup red wine
1 pound fresh or dried tagliatelle
4 to 6 teaspoons shaved bittersweet chocolate