The abundance of winter squashes in the fall, all of which are low in nickel, make them perfect for baking and cooking. Since most processed pumpkin purees are stored in stainless steel cans, I’ve started pureeing small baking pumpkins at home.
I store my nickel free pumpkin puree in glass Pyrex containers in the refrigerator. I’ve read you can freeze it, however I’ve never frozen my pumpkin puree, as I use to bake pies and breads almost immediately!