Show of hands. How many times have you actually finished a can of tomato paste? Be honest now. Here, I'll go first: Approximately zero. I tend to use tomato paste in recipes that require only a tablespoon or two, and then I stash the rest of the can in the fridge, furtively and guiltily, knowing it will not see the light of day again until it grows a thin layer of fuzzy organisms and goes to its final rest in the recycle bin. Shameful, I know. I feel shame.
There is, however, an answer to tomato paste waste. This is the very best way to store it away and make it easy to use later. It's time to rescue your tomato paste!