Topic summary
Orange peel
Extracted from the Wikipedia article Orange (fruit).
Marmalade
Oranges are made into jam in many countries; in Britain, bitter Seville oranges are used to make marmalade. Almost the whole Spanish production is exported to Britain for this purpose. The entire fruit is cut up and boiled with sugar; the pith contributes pectin, which helps the marmalade to set. The first recipe was by an Englishwoman, Mary Kettilby, in 1714. Pieces of peel were first added by Janet Keiller of Dundee in the 1790s, contributing a distinctively bitter taste. Orange peel contains the bitter substances limonene and naringin.