01 - Preheat oven to 390°F and line a baking sheet with parchment paper.
02 - In a large mixing bowl, combine ground beef, grated onion, minced garlic, parsley, cilantro, cumin, cinnamon, paprika, coriander, salt, and pepper. Mix thoroughly until evenly incorporated.
03 - Roll the mixture into small meatballs, approximately ¾ inch in diameter, and arrange on the prepared baking sheet. Bake for 12 to 15 minutes until cooked through and lightly browned. Set aside.
04 - While the meatballs bake, heat olive oil in a large soup pot over medium heat. Add the diced onion, carrots, celery, and red bell pepper. Sauté for 5 to 7 minutes until the vegetables have softened.
05 - Stir in the minced garlic, ground cumin, smoked paprika, turmeric, and cayenne pepper. Cook for 1 minute, stirring constantly, until the spices become fragrant.
06 - Pour in the broth and chopped tomatoes. Bring to a boil, then reduce heat, cover, and simmer for 10 minutes to allow the flavors to develop.
07 - Stir in the couscous and baked meatballs. Season with salt and pepper. Simmer uncovered for 5 to 7 minutes until the couscous is tender and the soup has thickened slightly.
08 - Remove from heat and stir in fresh lemon juice. Adjust seasoning as needed. Ladle into bowls and garnish with fresh cilantro or parsley. Serve hot.