Combine leek, ginger and apple juice concentrate in a large pot. Cover and simmer for 10 minutes or until leeks are tender. Add apples, squash, 1 cup of broth and 1 tsp splenda. Cover and simmer 1 hour or until very tender.
Puree soup using a hand-held immersion blender or in small batches in a regular blender.
Add remaining 3 cups of broth, salt and pepper. Simmer 10 minutes or until heated through. Stir in half and half. Serve and enjoy.