As is often the case, it depends. If you watch the video of this recipe, you will see that I did not. This is because I didn't have any tough looking silver skin and the pressure cooker makes everything soft, however, if you have a lot of the tough silver skin then that answer follows. The answer is Yes, if the butcher has not already done this for you, then you will need to pull the membrane from your baby back ribs. Here's a tutorial: Tutorial