Extend the life of cheese and cut onions with butter. Coat the cut edge of a hard cheese with butter. It will prevent the molding process that comes all too quickly otherwise. For onions, spread some butter on the cut part and wrap in aluminium foil.
How to can potatoes. This is a money saver, especially in winter. Avoid Botulism: Do Not Can Potatoes in a Hot Boiling Water Bath Canner : Vegetables and Herbs : Preserving and Preparing : Food Safety : Food : University of Minnesota Extension