Lentil Soup with Beef

Name: Lentil Soup with Beef
Ingredients: 2 tablespoons olive oil; 1 1/2 pounds boneless beef chuck, cut into 1-inch cubes; Salt and freshly ground black pepper; 3 large celery stalks, chopped; 2 large carrots, peeled and chopped; 1 large onion, chopped; 6 garlic cloves, chopped; 1 1/2 teaspoons chopped fresh rosemary leaves; 1 1/2 teaspoons dried oregano; Six 14-ounce cans beef broth; One 28-ounce can diced tomatoes in juice; 2 cups (about 11 ounces) lentils, rinsed; 1/3 cup chopped fresh Italian parsley leaves