variety of homemade jams in glass jars - Stephaniefrey/Getty Images Fresh fruit is a natural treat, but when it's converted into a spreadable, sweet-tart jam, there's almost nothing it can't do.

Many cooks have a bit of trepidation about canning. And with good cause — canned low-acid foods such as vegetables, meats and some tomatoes can harbor harmful organisms if not processed properly. But ...

Pectin is the soluble fiber found in most non-woody plants, particularly apples, plums, apricots, and citrus peels or pulp. The ingredient is commonly added to foods as a thickener, especially in jams ...