In a nonstick Dutch oven, saute the celery, onions, leeks, green pepper and garlic in oil until tender. Add the potatoes, broth, pepper and salt. Bring to a boil. Reduce heat; cover and simmer for 10-15 minutes or until potatoes are tender, stirring occasionally.
Puree soup to desired consistency using an immersion blender. Or, cool soup slightly and puree in batches in a blender. Return to pan. If desired, stir in coconut milk. Cook and stir until heated through. Sprinkle with green onions.
