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Prepare grill for cooking.
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Toss together sweet potatoes, oranges, onions, butter, oil, and salt and pepper to taste.
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Put a 2-foot-long double layer of foil on a work surface. Place half of sweet potato mixture in center and sprinkle with 1/2 cup raisins. Cover with a third sheet of foil and tightly roll up all sides to seal. Wrap packet in a fourth sheet of foil to ensure insulation. Make another packet with remaining vegetables and raisins.
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Put packets side by side directly on hot coals. Cover grill and open grill vents, then grill packets until vegetables are tender, about 30 minutes.
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While packets are grilling, stir together honey, lemon juice, and parsley. Remove packets from grill and carefully unwrap. Drizzle vegetables with honey mixture.