Heat the oil in a large nonstick skillet over medium heat. Add the leeks, onions, carrots; cover and cook 5 minutes or until tender. Add the curry powder, sugar, ginger, garlic and lemongrass; cook 1 minute, stirring constantly.
Place the onion mixture in a 5-quart electric slow cooker. Pour in the vegetable broth. Stir in the chickpeas and coconut milk. Add salt and pepper to taste. Cover and cook on low for 4 hours. Serve with rice.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.