Cooking : Beef and Lentil Soup

Ingredients
2 tablespoons olive oil
1 pound beef chuck, cut into 1-inch cubes
salt and pepper to taste
2 large stalks celery, chopped
2 large carrots, chopped
1 large onion, chopped
6 cloves garlic, chopped
1 1/2 teaspoons dried cilantro
1 teaspoon dried oregano
2 (32 ounce) cartons chicken broth
1 (28 ounce) can diced tomatoes
2 cups dry lentils
1/4 cup chopped fresh parsley
1/2 cup grated Parmesan cheese, or to taste

Directions
Heat the olive oil in a large pot over medium-high heat until it begins to smoke. Season the beef with salt and pepper, then gently place into the hot oil, and brown on all sides, about 8 minutes. Once browned, remove the beef and set aside, reserving the remaining oil in the pot. Stir in the celery, carrot, onion, garlic, cilantro, and oregano; cook and stir until the onion has softened and turned translucent, about 8 minutes more.
Pour in the chicken broth, tomatoes, and browned beef. Bring to a boil over high heat, then reduce heat to medium-low, cover, and simmer until the meat is beginning to turn tender, about 1 hour.
After the soup has simmered 1 hour, add the lentils, recover, and continue simmering until the lentils are tender, about 40 minutes. Season to taste with salt and pepper, then stir in the parsley. Sprinkle with Parmesan cheese to serve.