Can I double a jam or jelly recipe?
Never double a jelly or jam recipe. If a double batch of jelly or jam is cooked for the usual time, it will be undercooked--which means the jelly or jam will be soft and runny. If boiled longer, it will have a caramelized flavor and dark color.
Barbara Willenberg, Nutritional Sciences, University of Missouri-Columbia
Last update: Tuesday, May 05, 2009