Jellies generally use the whole fruit, including the peel and core which contain a lot of pectin, the natural sugar within a fruit to make it jell. With some fruits, the extracted juice will contain all of the necessary ingredients without supplement, like tart apples, blackberries, and grapes. With others, such as apricots, peaches, and raspberries, you will have to add either acid, pectin, or both. Additional pectin must be added to these types of fruits to make them jell properly.
Jellies generally use the whole fruit, including the peel and core which contain a lot of pectin, the natural sugar within a fruit to make it jell. With some fruits, the extracted juice will contain all of the necessary ingredients without supplement, like tart apples, blackberries, and grapes. With others, such as apricots, peaches, and raspberries, you will have to add either acid, pectin, or both. Additional pectin must be added to these types of fruits to make them jell properly.