Cut tenderloin into 8 pieces. Slice each piece again, but do not cut all the way through; open and flatten each piece, pounding slightly with meat mallet. , In a large skillet over medium-high heat, cook the pork in butter until no longer pink, 5-6 minutes on each side. Remove to a serving dish and keep warm; discard drippings. , In the same skillet, cook broth and tarragon over high heat until reduced by half. Reduce heat; stir in cream and mustard. Season with salt and pepper. Spoon over pork. Serve with noodles if desired.