Sterilize four 1-pint jars in boiling water and set them aside on a clean kitchen towel. Combine the vinegars, water, and sugar in a large nonreactive pot (mine is a copper jam pot) and cook over ...
I included pectin in my blackberry jam recipe because I was worried about my jam not setting enough. Leave it out if you prefer. If you choose to skip the pectin, you'll need to cook the jam longer, ...