Mix together the tomato sauce, cilantro, cumin, harissa, paprika and cinnamon.
For the meatballs: Preheat the oven to 500 degrees F. Soak the bread in just enough water to cover for 1 minute.
Pour into a colander and let sit for 10 minutes. Squeeze all the excess water out.
Meanwhile, gently cook the onions and garlic until translucent.
Let cool, then transfer to a bowl.
Add the chuck, pork, cilantro, parsley, cumin, paprika, pepper, salt, chile powder, ginger and eggs and mix thoroughly.
Portion and shape the mixture into 3 1/2-ounce balls.
Heat oil over medium-high heat in a large saute pan and brown the meatballs on all sides.
Transfer to a large baking dish, cover with the meatball sauce and wrap with aluminum foil. Braise the meatballs in the oven until cooked through but not dry, 20 minutes.