This recipe comes from DH's favorite book, Weber's Big Book Of Grilling. Removing the membrane from the underneath side results in tender, "falling off the bone" ribs. To cook on indirect medium heat simply means to have your fire on one side and your meat on the other side so your meat is not directly over the fire. These ribs are "finger-licking" and "out of this world" good. I hope you enjoy them as much as we do.