As the author of the much ballyhooed—and deservedly so—The Blue Chair Jam Cookbook explains, it takes a very large pan to make even a relatively small batch of preserves. Reason being, in order for the jam to have a spreadable consistency when cool, a large quantity of moisture must be cooked out of them. Yet in order for the fruit’s original flavor to remain intact, the preserves need to be over heat for as little time as possible. As a consequence, a wide pan is essential, as it allows a maximum of evaporation to occur in a minimum of time. If you decide to make a larger batch, bear in mind the moisture to be eliminated is directly proportional to the quantity of fruit used, so it would, in theory, need to be cooked for a much longer time. To ensure you do not compromise the quality of the preserves, you may want to make a couple small batches rather than a single large one.