In a 6-qt. stockpot, combine the first 4 ingredients; bring to a boil. Reduce heat; simmer, covered, until tender, 10-12 minutes. Stir in garbanzo beans; heat through., Remove from heat; stir in spinach. Let stand, covered, until spinach is wilted, about 5 minutes. Stir in remaining ingredients. Serve warm, or refrigerate and serve cold.