A marmalade is a sweet spread that is defined as a fruit jelly with small pieces or slices of fruit or fruit peel suspended in the jelly. Marmalades traditionally contain citrus fruit.
Citrus, such as oranges and lemons, have natural pectin. So many marmalade recipes do not include added pectin for form a gel. Therefore, a tested recipe is best to get the best results for a tasty home-canned marmalade. It is a balance of acid, sugar, pectin, and fruit to get the best result.
Marmalade recipes are available from the National Center for Home Food Preservation.