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1
In a 12-inch (or larger) skillet, melt the butter over medium-high heat. Add the oil, and when hot, add the onions to the skillet, along with a pinch or two of kosher salt and a few grinds of black pepper. Cook, stirring often, for about 10 minutes, then lower the heat to medium and continue to cook, stirring occasionally, until the onions turn a rich golden brown, or about another 30 to 40 minutes. Do not rush this process as you do not want any onions to burn or dry out.
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2
Meanwhile, in a medium mixing bowl, whisk together the vinegar, brown sugar, mustard, celery or caraway seed (if using), and pure maple syrup along with more salt and pepper; set aside.
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3
When the onions are ready, raise the heat to medium-high again and add the apples. Cook, stirring frequently, for about 5 minutes, or until the apples just begin to soften. Add the vinegar mixture and deglaze the pan by scraping the bottom. If you're using a nonstick skillet, there will be nothing to deglaze. Stir in the raisins (if using) and cover the skillet, lower the heat to medium-low, and let simmer for 15 to 20 minutes, or until the apples are soft. Remove the lid and raise the heat back to medium-high. Cook the mixture, stirring often, until the liquid in the pan thickens enough that you can drag a spoon across the bottom and the liquid flows slowly back in, or is syrupy. Remove from the heat and set aside to cool. Taste and adjust the seasoning.
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4
This stuff is delicious and goes well with grilled or roasted pork.
