By Isla Quinn
Sharp. That is the first thing about a Seville orange, and it is the point. Wikipedia lists its other names as bitter orange, sour orange, bigarade orange and marmalade orange, and says its taste is distinctly bitter or sour. It is not a fruit for the fruit bowl. It is a fruit for the pan.
What the fruit is
Wikipedia gives the species as Citrus × aurantium, a hybrid of the pomelo and the wild mandarin. It says the tree spread through India and Iran into the Islamic world as early as 700 AD. The plant guide from the Royal Horticultural Society, a UK gardening charity, lists the Seville orange among the citrus varieties “often used for marmalade”. It adds that citrus fruit generally takes about nine to twelve months to ripen, so flowers and fruit can sit on one plant together, and that citrus plants will not reliably survive winters outdoors, even in the warmest parts of the UK. So the jar on a British breakfast table depends on a tree that does not live in Britain.
The trees in the street
Wikipedia’s page on Seville says bitter Seville oranges grow on trees lining the city streets. Large amounts are collected and shipped to Britain, where they become marmalade. The page on the bitter orange puts it a little differently: once a year the fruit is collected from Seville’s trees and shipped to Britain, and it is rarely eaten locally in Andalusia. Neither page gives a number of trees or tonnes exported, and we give none.
One odd local use appears in the same article. In 2021, Seville’s municipal water company Emasesa started a pilot project to turn methane from fermenting fruit into electricity, planning to use 35 tonnes of fruit to power one water purification plant. We read that from Wikipedia and could not find the water company’s own page on it, so we report it as the encyclopaedia’s account.
Why marmalade makers want it
Wikipedia says the Seville orange is prized for British orange marmalade and that its pectin content is higher than that of the sweet orange, which gives a better set and a higher yield. Pectin is what makes fruit and sugar turn to gel. The Marmalade article, also Wikipedia, says that in Britain marmalade is usually made from the bitter or Seville orange, favoured for its high pectin and tart flesh. Britannica defines marmalade as a sweetened, clear jelly-type preserve with bits of fruit and rind suspended in it, usually made from citrus, and says that combining fruit with sugar and acid lowers the pH and binds water, which inhibits microbial growth.
As for the season, the only source we found that touches it is a Wikipedia image caption, which says English marmalade is traditionally homemade in winter. We found no source giving the exact weeks the fruit reaches shops, so check with your greengrocer.
Where the word comes from
Wikipedia traces marmalade through French marmelade to Portuguese marmelada and to the Greek melimÄ“lon, “sweet apple”. It gives the oldest known Portuguese use as Gil Vicente’s play of 1521. A different Wikipedia page says the name likely comes from the Portuguese marmelo, quince, and not from any Scottish family. We show both and do not choose.
The Dundee story and its holes
Everyone knows a Dundee story. The Janet Keiller page on Wikipedia says James Keiller ran a small confectionery shop in Dundee’s Seagate in the 1760s, and that Keiller’s is believed to be the first commercial marmalade brand in Great Britain. Legend says he bought a Spanish ship’s cargo of Seville oranges when the ship sheltered from a storm. The Marmalade article calls that legend “decisively disproved” by food historians. The Janet Keiller page is gentler: it says the shipment was probably only a few boxes and that oranges of this kind were mostly used for medicine and some recipes, not eaten fresh. Both pages treat the tale as a legend.
The page also says Janet Keiller may have made her main change in 1797 by adding thin strips of orange rind, giving chip marmalade, though it says the source stresses “may have been”. It adds that marmalade existed in Spain and Portugal since at least the fifteenth century, so the Keillers did not invent it. A Scottish orange marmalade recipe appears in a 1736 cookbook, it says.
Older recipes
According to Wikipedia, Eliza Cholmondeley’s English recipe book of 1677 holds one of the earliest marmalade recipes, titled “Marmelet of Oranges”. The same article calls Mary Kettilby’s 1714 book the first printed orange marmalade recipe. Those two dates describe a manuscript and a printed book, so they do not clash.
Reading a jar: what the law says
Wikipedia reports that a 1979 EEC directive defined marmalade as a gelled mixture of sugars and citrus fruit material, requiring at least 20% citrus fruit, of which 7.5% had to come from the endocarp. It adds that an EU amendment from 2024 keeps the citrus marmalade requirements the same and renames citrus-based marmalades as “citrus marmalade”, for example “orange marmalade”, while allowing member states to permit the word “marmalade” for other jams. It also says a possible EU–UK agreement could extend these rules to the UK, which the UK government expects to take effect after mid-2027. That is a summary of a changing law, so check the current text if it matters to you. We read no official legal source.
Dates in order
- 700 AD: the bitter orange reaches the Islamic world, as early as this, according to Wikipedia.
- 1521: oldest known Portuguese use of marmelada, according to Wikipedia.
- 1677: “Marmelet of Oranges” in Eliza Cholmondeley’s recipe book, according to Wikipedia.
- 1714: Mary Kettilby’s book, the first printed orange marmalade recipe, according to Wikipedia.
- 1760s: James Keiller’s shop in Seagate, Dundee, according to Wikipedia.
- 1979: the EEC directive defining marmalade, according to Wikipedia.
- 2021: Emasesa’s pilot project with fermenting fruit, according to Wikipedia.
Side by side
Origin in Seville: legend says Arabs brought the tree around the tenth century to scent and shade patios and gardens (Wikipedia, Seville page); the bitter orange page says the tree reached the Islamic world as early as 700 AD. The pages date different events, and we do not choose. The first commercial marmalade: Keiller’s in Dundee (Wikipedia) against marmalade known in Spain and Portugal since at least the fifteenth century (same page). Our reading: “first commercial brand” and “first marmalade” are different claims.
What kind of sources these are
Mostly Wikipedia, which anyone can edit, across four pages. The Royal Horticultural Society plant guide is a charity’s page and Britannica an encyclopaedia. We found no Spanish government, trade body or museum page for the trees, and the Seville page’s claims about local use come from Wikipedia alone.
Questions a buyer would ask
Is the jar made from Seville or sweet oranges? What share is fruit? Is the label “orange marmalade” or something looser? Our reading: the bitter tang is not a fault, it is the fruit. We name no jar, no maker and no price.
What we left out
We left out neroli, aromatherapy and herbal medicine uses, which sit outside the craft and food scope of this site. We left out the long list of other uses for bitter orange peel and juice, which had no second source. We left out any claim about how many trees line Seville’s streets, since we did not find one in a source we could read.
Quick answers
Why are Seville oranges used for marmalade? According to Wikipedia, their pectin content is higher than that of the sweet orange, which gives a better set and a higher yield, and the fruit is tart.
Where do Seville’s oranges go? Wikipedia says large amounts are collected once a year from the city’s street trees and shipped to Britain, and that the fruit is rarely eaten locally.
What must marmalade contain? According to Wikipedia, the 1979 EEC directive required at least 20% citrus fruit, 7.5% of it from the endocarp.
Roam first. Shop later.
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