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Marmalade is a clear, sweetened jelly that contains suspended pieces of fruit and fruit rind. It is typically made from citrus fruits and is a type of fruit preserve. The process of making preserves like marmalade involves combining fruit with sugar and acid, which helps to preserve the fruit by lowering its pH and binding water, thus inhibiting microbial growth.12

Fruits themselves are generally acidic, high-moisture foods that are a good source of dietary fiber and vitamins, particularly vitamin C. They are prepared for consumption through various processing methods.2

A "marmalade tree" can refer to a tropical American tree (Calocarpum zapota) with mahogany-like wood and an egg-shaped, single-seeded fruit, or it can refer to the mammee tree.3

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