Costco's baby back ribs already have the back strap membrane removed saving time and effort, and they seem to be extra meaty as well compared to Kroger or Safeway, or Sam's club ribs.
Not the Costco's in Charlotte, NC. I stopped buying BB at Costco's because it's so darn hard removing the membrane. I usually go with Costco's spareribs.
I had exactly the same thing happen-two racks and one had the membrane and the other didn't!Are you sure you weren't trying to remove the inner membrane? That might explain the difficulty. This is an honest question, not a smart a$$ remark. I only ask because I got a rack of ribs that had already been prepped once and screwed around with it for a bit, mostly making a mess of it, before I realized I was trying to remove something that wasn't there.
Huh?#1 The first rack were the St. Louis style with the (skirt) or skirt meat trimmed off. Some call it the flap. It is attached to the back side on the middle of the rack. It will burn if left on and the rack will not cook evenly. The other part that is removed is the lower edge of the rib tips. This is the brisket. It is full of cartilage. I usually trim this off (rib tips) and cook it on the grill and have a snack when it done. It will cook quicker than the racks of ribs.
#2 The second rack were the Spare ribs intack with the above mentioned rib tips and flap removed. The untrimmed ribs are cheaper per pound. Both will still have the membrane attached. Sometimes though one rare occasion, the St. Louis will have the membrane removed.