Peel the sweet potatoes.
Cut the sweet potatoes into wedges.
Soak the wedges in a bowl of cold water for 30 minutes.
Meanwhile, mix all the spices together.
Preheat the barbecue to 350°F.
Drain the sweet potatoes and pat dry with paper towel.
Place sweet potatoes in a large bowl.
Add spices to the sweet potatoes.
Drizzle the olive oil over the sweet potatoes and toss to coat.
Place on grill and cook for 10-15 minutes, turning every 3-4 minutes, until cooked through.
Remove from grill and serve.