Urfa biber, also called isot, is an almost-black chilli from the city of Şanlıurfa in south-eastern Turkey. Its dark maroon colour and smoky, chocolatey flavour come from an unusual method: the peppers are sun-dried by day and wrapped up at night to “sweat”. It’s only moderately hot but it tastes deeper than almost any other chilli.
The whole character of urfa biber lies not in the plant but in what happens to it after harvest, much like ancho (dried poblano) or chipotle (smoked, dried jalapeño). The ripe, dark-red peppers are picked and then treated over about a week in two halves of the day: through the day they lie in the fierce south-eastern Anatolian sun; at night they’re wrapped tightly in cloth or sheeting.
This nighttime wrapping is called “sweating”. The remaining moisture stays in the pepper, and in the heat of day and cool of night a mild fermentation sets in. Sugars and oils concentrate, the colour tips from red into deep purple and nearly black, and the flakes stay moist, oily, almost sticky, unlike any dry chilli you know.
The biggest misconception: isot tastes smoky but is never smoked. No fire, no smoke goes near the peppers. The smoky depth develops entirely during the sweating. Among the reasons are the tannins, which give isot a complexity you’d sooner associate with wine: notes of dark chocolate, raisin and dried plum, plus coffee, tobacco and a hint of wine tannin. It’s mildly sweet, with a fine acidity in the background.
This many-layeredness is also why isot is considered the most sophisticated of the Turkish chillies. Mild pul biber is fruity and direct; isot is dark, slow and enigmatic. You don’t scatter it over a dish for heat, but for depth.
Isot biber, Urfa biber, Urfa isot: all the same thing
Isot, isot biber, urfa biber, urfa isot and Şanlıurfa biberi all mean the same spice. “Biber” is the Turkish word for pepper, “Urfa” the city. The word “isot” itself comes from Ottoman Turkish and means, roughly, “hot weed”.
A detail that takes the origin seriously: in Turkey, urfa pepper is a protected geographical indication, officially registered as “Şanlıurfa Biberi”. It’s traditionally processed in family-run operations, in large part by women, knowledge passed down over generations. Buy real isot and you’re buying not just a spice but a piece of regional craft.
Isot in English: chilli, not pepper
In English isot is sometimes read as “Urfa chilli”, sometimes as “Urfa pepper”. Botanically, chilli is correct: isot is a Capsicum annuum pod, not a peppercorn. The “pepper” label stuck only because “biber” covers both in Turkish. For cooking the distinction hardly matters, for understanding it helps: you’re cooking with a special chilli, not a type of pepper.
How to use isot: from çiğ köfte to chocolate dessert
The moist, oily flakes are remarkably versatile and isot is at its strongest where its dark sweetness meets something savoury or fatty:
- In çiğ köfte. Isot is bound most closely to çiğ köfte. In the original preparation, a mixture of fine bulgur, tomato and pepper paste, spices and plenty of isot is kneaded by hand for three-quarters of an hour until it comes together, a communal ritual, not just a recipe. Use isot, and you cook a piece of that culture. It’s exactly why cooks from the region say it can’t be replaced: not because no other chilli is hot enough, but because no other tastes like it.
- On adana kebap and lamb. The smoky depth is made for fatty grilled meat.
- In browned butter over eggs. Foam isot briefly in butter and spoon over fried or scrambled eggs, a classic.
- Over roasted aubergine. The vegetable’s earthy sweetness and the isot’s reinforce each other.
- In stews and braises. A spoonful gives slow-cooked lamb or beans a dark base note.
- On hummus and labneh. A smoky counterpoint to the creaminess.
- In pasta and tomato sauces. Wherever you’d reach for chilli flakes but want more depth.
- On avocado toast. The modern favourite; smoke and fruit over mild fat.
- In chocolate desserts. Sounds daring, but it’s logical: isot’s chocolate-and-raisin notes lift dark chocolate or brownies to an adult level.
- In spice blends. As the dark, smoky component alongside cumin and sumac.
How to spot good isot
Three cues help at the shelf. The colour is deep purple to nearly black, never greyish-brown or dull. The texture feels slightly moist and oily, the flakes clinging gently. If it pours out bone-dry, it never really saw the sweating. On the ingredients list you should find peppers, a little salt, and at most a little oil.
Isot FAQ
What is isot? An almost-black Turkish chilli from Şanlıurfa (also called urfa biber/urfa pepper). It’s sun-dried by day and wrapped to “sweat” at night, which turns it dark, oily and smoky-sweet; with notes of chocolate, raisin and tobacco.
Is isot smoked? No. Isot tastes smoky but never meets fire or smoke. The smokiness develops entirely during the traditional sweating process.
How hot is isot? Only moderately; comparable to a mild jalapeño. The heat builds slowly and lingers rather than burning at once.
What’s the difference between isot and pul biber? Both are Turkish chilli flakes, but pul biber (e.g. Maraş) is bright red, dry-fruity and direct. Isot goes through the sweating process and becomes dark, oily and smoky-chocolatey; milder in heat, deeper in flavour.
What do you use isot for? Classically çiğ köfte, adana kebap and lamb, in browned butter over eggs, over roasted aubergine; and, surprisingly well, in dark chocolate desserts.
How long does isot keep? Shorter than dry chilli flakes because of its residual moisture. Store dry and well sealed.
Our Urfa chilli flakes / isot (50 g) comes from exactly this tradition; dark, oily, with the smoke-and-raisin depth no other chilli delivers. You only need to scatter isot over a fried egg in browned butter once to grasp why the people of Urfa consider it irreplaceable. It isn’t a spice that shouts, it’s one that takes a dish seriously.