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Preheat oven to 325 degrees.
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Place tenderloin in baking dish sprayed with non-stick spray.
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Season with salt and pepper to taste.
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Bake 35-40 minutes or until desired doneness.
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When pork is done, remove from pan and keep warm.
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Pour 2-3 Tablespoons of drippings from the pork into a medium saute pan.
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Heat over medium high heat; whisk in flour. Cook for 1 minute, stirring constantly with whisk.
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Slowly whisk in white wine; stir until smooth.
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Reduce heat and continue cooking until thickened and reduced by half, stirring as needed.
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Gradually stir in milk; bring to a simmer.
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Cook over medium heat until smooth and thick, stirring constantly.
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Add chopped sun-dried tomatoes and spinach.
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Continue cooking until completely heated through. Mixture will be somewhat thick.
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Slice pork tenderloin into medallions, approximatley 1/4-1/2 inch thickness.
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Arrange pork medallions on serving plate, top with spinach-tomato mixture.
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Season with salt and pepper, if desired.
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Sprinkle asiago cheese over the top and serve hot!