1. In a small bowl place butter.
2. Squeeze in the juice from the lime and zest from rind. Mix well.
3. Add salt and pepper to taste. Slice sweet potatoes, without breaking through the base of the potato.
4. Place onions and pats of seasoned butter between potato slices.
5. Wrap potatoes in foil and place on the grill.
6. Cook for about 15 minutes over medium to low fire. Serve.

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