They contain no gelatine and are set with natural pectin.
What's in it?
The very best pectin jellies contain nothing but fruit juices or purees, sugar, and pectin. Additional acid in the form of lemon juice is frequently added to these jellies to aid in setting.
Fruit Juice or Puree - The juice or puree not only provides the flavor and color of the jelly, it also contains the water needed for cooking. When using a juice such as pomegranate or grape, applesauce is added to the jelly to provide a better texture.
Sugar - Sugar in pectin jellies not only adds sweetness, but is a necessary ingredient for the pectin to bind properly. Cutting down on the sugar in a pectin jelly recipe will cause it not to set properly.
Pectin - Pectin is the binding agent in these jellies. Standard liquid pectin of the variety found in grocery stores should be used for the recipes in this book, not a low-sugar version.
Lemon Juice - In addition to a high sugar content, pectin requires a relatively high level of acidity in order to form a gel. Lemon juice is added at the end of cooking to induce the pectin to set.