Trim silverskin from pork tenderloin and discard.
Cut tenderloin into strips or bite-sized cubes, set aside.
Melt butter in a large skillet. Add mushrooms, garlic, and onion, and cook over medium heat for 5 to 7 minutes, stir often.
Add pork tenderloin, salt, and pepper to the pan and cook until lightly browned, approximately 10 minutes.
Incorporate tomato paste, paprika, and Italian seasoning, and mix thoroughly.
Gradually add flour to thicken the sauce.
Pour chicken broth, apple cider vinegar and lemon juice into the skillet, bring to a simmer, stirring occasionally for 15 minutes.
As the pork sauce is simmering, cook egg noodles according to package instructions
Remove stroganoff from heat, spoon sour cream into the stroganoff and mix well.
Serve pork stroganoff over warm noodles, garnish with parsley and enjoy!