How to Butterfly Pork Tenderloin
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Step 1
Holding the knife blade flat, so that it's parallel to the board, make a lengthwise cut into the center of the tenderloin, stopping short of the opposite edge so that the flaps remain attached.
Step 2
Open the tenderloin as you would a book.
Step 3
Cover with plastic wrap. With a meat mallet, rolling pin or heavy pan, pound the meat to the desired thickness.