Place beans and water in a large pot. Soak overnight. Bring to a boil, cover, reduce heat, and cook until tender, about 2-3 hours.
Add onion, yams, carrot, celery, and leek. Cook for 30 minutes. Add remaining ingredients. Cook an additional 30 minutes.
Serving Suggestions: Pour into individual bowls or over any whole grain. Also good as a topping for potatoes or whole-wheat bread.
Helpful Hint: This dish can easily be made in a slow cooker. Add all ingredients at once and cook on the high heat setting for 8-10 hours. Be sure to soak the beans overnight before you begin.