Heat the oil in a large soup pot over medium heat. Add the onions, carrots, and celery, along with a pinch of salt to get the onions sweating. Saute, stirring frequently, for 5-7 minutes, or until the onions are totally clear and soft. Add the garlic and the celery seed (if using) and cook for another 2 minutes, stirring constantly.Add the cabbage, rice, both kinds of paprika, salt, pepper, broth, and water to the pot. Bring to a boil. Reduce to a simmer and cover the pot. Simmer for 45 minutes, or until the rice is completely cooked and tender.With the soup still simmering, stir in the chickpeas and lemon juice. Turn off the heat and check the soup for seasoning. Add salt to taste, as well as a dash of red pepper flakes if you'd like a little heat. Serve.