I’m sure this isn’t original but it suddenly occurred to me a while back as I was throwing away yet another opened can, from which I had previously used 1 Tbsp some months ago, of tomato paste with little green fury things on top that there had to be a better way. Viola! I got out the plastic wrap and extracted about three scoops each of about 2 Tbsp of tomato paste from the newly opened can, put each 2 Tbsp scoop into a plastic wrapped bundle and threw it into the freezer. And when I next needed tomato paste I actually remembered my freezer pets.