Moroccan Beef and Lentil Soup

Place chickpeas into a large container and cover with several inches of cool water; let soak, 8 hours to overnight. Drain.

Heat vegetable oil in a large pot over medium-high heat; stir in celery and onions. Saute until vegetables have softened and turned translucent, 6 to 10 minutes. Add tomatoes and simmer for another 6 minutes. Add 8 cups water, beef, drained chickpeas, lentils, and marrow bone; bring to a boil. Reduce heat to low, cover, and cook for 2 1/2 hours.

Combine remaining 1/2 cup water and flour in a small bowl; whisk until paste-like. Pour into the soup with parsley and cilantro. Season with salt and pepper and cook for 30 minutes. Add lemon juice and cook for an additional 20 minutes, adding vermicelli during the last 5 minutes.

Remove marrow bone and serve.