"Top pork tenderloin with warm buttery apples and caramelized onions...."
INGREDIENTS
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2 tablespoons butter
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1 medium onion, thinly sliced and separated into rings
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2 medium cooking apples, cored and sliced
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1/8 teaspoon salt
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1 tablespoon cider vinegar
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1 12 ounce pork tenderloin
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Salt
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Ground black pepper
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2 tablespoons olive oil