Bake the sweet potatoes in the microwave oven or via your favorite baking method. Allow to cool, peel and chop. Set aside.
Melt the butter in a large pot over medium heat. Add the red onion and thyme and sauté until the onions are very soft.
Add the orange juice, and simmer for 5 minutes.
Add the veggie broth and bring back to a simmer. Add the potatoes and simmer for 10 minutes. Puree the soup using an immersible blender, food processor, or blender. If using a food processor or blender, return the soup to the pot and add the Apple Cider Syrup and salt to taste.
Serve hot.