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Preheat oven to 425 degrees, season the pork tenderloin with seasoning salt, place in roasting dish and place in preheated oven; back for 20 to 25 minutes or until meat thermometer registers 160 degrees.
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Remove meat from oven and cover with foil, allow to stand while making sauce.
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In a small skillet, add the juice, broth, ketchup, honey and orange zest; bring to a boil, reduce heat and simmer for 10 to 15 minutes or until liquid is reduced by half.
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Slice the pork in 1/4 inch slices, add to sauce with the rosemary and simmer for 4 to 5 minutes or until meat is nicely glazed.
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If desired, mix the 1/4 teaspoon arrowroot starch in a small amount of water and add to sauce to thicken slightly.