In 5-quart Dutch oven, heat oil over medium-high heat. Add onions, gingerroot and garlic. Cook 4 to 5 minutes, stirring frequently, until softened and beginning to brown. Add coriander, turmeric, salt, cumin, pepper and red pepper. Cook and stir 30 seconds. Add chickpeas; cook and stir 5 to 6 minutes or until chickpeas begin to brown. Add coconut milk, tomatoes and sweet potatoes; heat to boiling. Reduce heat to medium-low; cover and simmer 25 to 30 minutes, stirring occasionally, until sweet potatoes are tender. Add spinach; stir 1 to 2 minutes or until wilted.