Brown/ Sauté: Place a
large pot over medium-high heat and heat the oil. Lay the meatballs and brown two sides of them. Do this step in batches to prevent overcrowding. Once done, remove all of them. Lower the heat to medium-low. Add the onion, carrots and celery. Sauté until slightly softened. Stir in the garlic, marjoram, cumin, all spice, and cloves. Cook for one minute. Add the tomato paste, cook for one minute. Add the tomatoes, and cook until slightly softened. Pour in the beef broth, add the chipotle pepper. Bring to a boil, over medium-high heat. Reduce to a gentle simmer, over medium-low heat. Add all of the meatballs back into the pot and the cilantro. Tie the thyme, oregano and mint sprigs together with a string. Then, add into the pot. Cover and allow the meatballs to cook, about 10 minutes.