Jan 25, 2011
Sugar Sugar inhibits the growth of bacteria, keeping your jam fresh, fruity, and safe to eat. Jam recipes are formulated to call for a certain ratio of pectin to sugar, and they will not jell properly if you don't use the correct amount of sugar. If you'd like to make less-sweet jam, you'll need to buy a special kind of pectin that's formulated to work with less sugar.
—PaddyMcK