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Place the potatoes in the bottom of a large pot.
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Layer onions and kale on top of potatoes.
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Lay the coiled up smoked sausage on top of the kale.
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Pour water in the bottom of the pot- just enough to almost cover the potatoes, and cook, covered, over medium heat until the potatoes are fork-tender.
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While the potatoes are cooking, fry the bacon up until crispy; drain, but save the drippings.
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When the potatoes are done, remove the sausage from the pot and cut into 3-4-inch chunks.
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Drain any excess water from the pot, and add the bacon, drippings and all, along with the vinegar.
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Using a potato masher to smash it until it looks like slightly lumpy mashed potatoes (very rustic).
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Add the butter and season with pepper if you wish.
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Serve with the sausage on the side.
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Pour gravy over the top, if desired.