Cut pork tenderloin into 2 cm thick medallions and, using a meat tenderizer, flatten medallions into cutlets between sheets of wax paper. Sear in hot butter for 1 minute per side. Set aside and keep warm.
Add shallots and mushrooms to skillet and brown for about 3 minutes. Add diced apples and deglaze with cider. Reduce liquid by half then add cream, salt and pepper. Reheat pork cutlets in sauce preparation.
Arrange pork over 4 warm plates and drizzle with sauce, sprinkle with chopped chives. Serve with seasonal vegetables or pearl barley.