Bake or steam the sweet potatoes.To bake: poke holes in the sweet potatoes with a fork. Place them in a 400 degree oven for 40-60 minutes until they can be easily pierced with a fork.To steam: boil water and place potatoes in a steaming basket over the boiling water. Cook for 30-40 minutes, until the sweet potatoes can be easily pierced with a fork.
Meanwhile, crumble the block of tempeh into small pieces.
Process the red onion, garlic, chili powder, cumin, oregano, salt, cloves, and water in a food processor or blender until relatively smooth. Stir into the tempeh and let marinade for 10-15 minutes.
After the tempeh has marinaded, heat the tempeh in a pan for 5-10 minutes. Use the vegetable broth to keep the tempeh from sticking to the pan.
When the sweet potatoes are cooked through, slice each potato longways with a knife and create an opening in the potato. Fill each potato with the tempeh mixture. Sprinkle with parsley (optional). Enjoy!