Jam sugar - Südzucker Gelier Zucker 1plus1 Used in a ratio of one part fruit to one part jam sugar, this is the classic preserving sugar for jams, marmalade and jellies. Gelier Zucker 1plus1 gives marmalade, jams and jellies a full flavor, perfect sweetness and a long shelf life without the need for preservatives. Best of all, it takes only four minutes of boiling time to complete the process. Gelier ZUcker 1plus1 contains sugar, citric acid and the gelling agent pectin.