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heat oil in a large cast-iron or other heavy skillet over medium-high heat.
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add apples, cut side down, and cook, turning occasionally, until golden brown, 5β8 minutes.
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prick sausages with a fork, add to skillet with apples, and cook, turning occasionally, until browned, 10β12 minutes.
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add wine and vinegar to skillet.
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bring to a boil, reduce heat, and simmer until thickened (liquid should coat a spoon), about 4 minutes.
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add spinach and toss to coat
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season with salt and pepper.
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serve with pan juices spooned over.