"Marmalade is a fruit preserve made from the juice and peel of citrus fruits boiled with sugar and water. The best-known version is made from bitter orange, but it is also made from lemons, limes, grapefruits, mandarins, sweet oranges, bergamots, and other citrus fruits, or a combination.
The preferred citrus fruit for marmalade production nowadays is the Spanish Seville or bitter orange, Citrus aurantium var. aurantium, prized for its high pectin content, which sets readily to the thick consistency expected of marmalade. The peel imparts a bitter taste.
The word "marmalade" is borrowed from the Portuguese marmelada, from marmelo ´quince´." - (en.wikipedia.org 26.01.2020)
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