Preheat oven to 400°. Line a large roasting pan with foil, spray
with cooking spray and place in oven.
Remove fat from pork tenderloins and butterfly the meat. Cut eacy nearly in
half lengthwise. Open the pork and lay flat like a book. Pound
it flat with the palm of the hand, a smooth meat mallet, or the rolling pin.
Rub pork tenderloins with olive oil and sprinkle
rosemary on all sides. Remove the pan from the oven and place
pork on hot foil. Return to oven and roast 15 to 20 minutes. The tenderloins should register 155° F. on an instant read thermometer stuck into the thickest parts.
Remove the tenderloins
and let stand 5 minutes before slicing.