Swap-Box Hero: Homemade Tomato Paste

Who swaps out plum tomatoes? Well, whoever you are (and I’m guessing it was one of our half-dozen picker-uppers who ordered a supplemental 25-pound box from the co-op), I thank you. Your bag plus my bag gave me a four-pound quorum—just enough for a small batch of über-concentrated tomato paste. Another adventure in really, really slow food,…