Would it work to can pumpkin butter using canned pumpkin?
Using canned pumpkin, can I then use that and make pumpkin butter and then using water bath can the final treat?
Jackson County Oregon
While it seems that the commercial canning should make the pumpkin puree safe for use in other products, like pumpkin butter, it does not. Pumpkin puree and pumpkin butter are just too thick to allow full heat penetration using home food preservation methods. Once condensed and commercially canned, the pumpkin is even thicker than the original product. In addition, the pumpkin remains a low acid product, so boiling water bath temperatures would not ever get hot enough to destroy potential bacteria that might grow in it once sealed in the jars. Consider freezing the pumpkin butter, or even drying it as a leather! The only way to can pumpkin safely at home is in cubes, with enough liquid circulating around it to carry heat, in a pressure canner. http://nchfp.uga.edu/how/can_04/pumpkin_winter_squash.html