Drain the garbanzo beans and add to the pot with the tomato puree and water. Bring the liquid to a boil then cover, lower and simmer for 25-30 minutes or until the garbanzos and meat are cooked through.
In a small pot add lentils and cover with water. Bring to a boil, then cover and lower to a simmer for 15 minutes. Turn off the heat and set aside while you wait for the soup to be done.
Optional: In a small bowl mix together cornstarch and cold water until no clumps remain. Uncover the soup and mix in the cornstarch water slurry to thicken.