Marmalade is a fruit preserve that is made up of citrus fruits. Mandarin marmalade is orange marmalade. Orange including its peel is cooked with sugar to get a thick texture. Mandarin marmalade is generally light-textured, gelatinous with large chunks of orange throughout. Marmalade is a combination of the sweetness of jam and bitterness of orange chunks. Mandarin marmalade lasts up to a month when stored in a refrigerator. Marmalade makes a tangy topping for your oatmeal and it can also be glazed over crackers.