Preheat the oven to 375 ° F. Thoroughly wash the sweet potatoes and cut them into chunks, leave the skin on. Spread the sweet potatoes across a cooking sheet or large roasting pan. Sprinkle the cumin, cinnamon, pepper, and sea salt over the potatoes, then pour the oil over and mix until the herbs and oil are evenly coating the potatoes. Sprinkle water over the potatoes and place in the oven. Check every 15 minutes to turn the potatoes as they brown. Let them cook 40 minutes, until nicely browned.
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