Smoke them now as others have said. The Pembroke is essentially Margate with a Cognac topping. Quite a strong funky flavor if you ask me. One good reason to open the tins and smoke them (jarring whatever you don't get through) is that you need to gain the knowledge of trying these blends. This way you can add the experience to your sense of what you like and dislike. It's a journey and cellaring blends you've never tried does not move you along that journey. For me, a lover of Balkans, trying Pembroke actually allowed me to cross it off the list of blends I'm chasing.