Persian Rob (Fruit Paste) Guide: Pomegranate, Sour Grape & More
Rob is the Persian word for a concentrated fruit paste — fruit cooked down slowly until thick, tangy and intensely flavoured, used as a cooking ingredient rather than a spread. Unlike a jam, rob is not eaten on its own with a spoon; it is stirred into stews, marinades and dressings to add sour, fruity depth. A small spoonful goes a long way. Below: every type, how rob is used, what the concentration process actually does, and how to tell a real pomegranate rob from a diluted one.
Types of Persian Rob (Fruit Paste)
Pomegranate Paste (Rob Anar)
رب انار — The most essential rob in Persian cooking, a tangy-sweet reduction of pomegranate juice. It’s the key ingredient in fesenjan, and also works in marinades and salad dressings. Shop pomegranate paste.
Sour Grape Paste (Rob Ghooreh)
رب غوره — Made from unripe sour grapes, this rob adds a sharp, tart edge to stews and rice dishes — a traditional souring agent used the way lemon juice might be used elsewhere. Shop sour grape paste.
Sour Cherry Paste
A tart, deep red paste that adds bright acidity to stews and sauces, or can be diluted into a quick sharbat-style drink. Shop sour cherry paste.
Quince Paste
Quince cooked down into a fragrant, slightly floral paste — good in stews or thinned into a glaze for roasted meats. Shop quince paste.
Green Plum Paste (Rob Goje Sabz)
رب گوجه سبز — Made from tart, unripe green plums, giving a sour punch similar to sour grape paste but with its own distinct fruity edge. Shop green plum paste.
Cornelian Cherry Paste
Made from zoghal akhteh (cornelian cherry), a tart red fruit — this rob brings a fruity sourness used in stews and rice dishes across northern Iran. Shop cornelian cherry paste.
Green Lemon Paste
A bright, citrusy paste made from green (unripe) lemons, used to add a sharp sourness to stews and marinades. Shop green lemon paste.
Orange Paste
A citrusy, slightly sweet rob made from orange, milder than the tart sour-fruit pastes and useful for balancing richer dishes. Shop orange paste.
Medlar Paste (Rob Azgil)
رب ازگیل — Made from medlar (azgil), a tart, mildly astringent fruit — a less common, more traditional rob. Shop medlar paste.
Raspberry Paste
A fruity, tangy-sweet rob made from raspberries, good for glazes or diluted into a quick drink. Shop raspberry paste.
Prunella Paste (Rob Aloocheh)
رب آلوچه — Made from prunella (aloocheh), a small tart plum — the same fruit used in aloocheh lavashak, here concentrated into a cooking paste. Shop prunella (aloocheh) paste.
How Rob Is Used in Cooking
- In stews (khoresht) — a spoonful of rob adds sour depth to dishes like fesenjan (pomegranate) or any stew that calls for a tart backbone.
- In marinades — rob’s concentrated acidity helps tenderize and flavor meat before grilling.
- In dressings and sauces — a small amount thinned with oil and seasoning makes a quick, tangy dressing.
- Diluted into a drink — some robs, like sour cherry, can be mixed with water and ice similar to a sharbat.
What Cooking-Down Actually Does
Rob is made by simmering fruit juice or pulp until most of its water has evaporated. That single process does three things at once, which is why rob behaves so differently from fresh fruit in a dish:
- It concentrates acidity and sugar together, producing the characteristic sweet-sour intensity — and making rob self-preserving without needing added sugar the way jam does.
- It concentrates the fruit’s pigments and polyphenols along with everything else.
- It thickens by reduction rather than by pectin gelling, which is the technical difference between a rob and a moraba (jam).
Why Pomegranate Rob Is the Most Prized — and the Most Faked
Pomegranate is the best-studied of these fruits, and the chemistry is genuinely unusual. Its dominant polyphenol is punicalagin, described in Herbal Medicine: Biomolecular and Clinical Aspects (NIH Bookshelf) as “the known largest molecular weight polyphenol,” with a molecular weight above 1,000 — and it is “reported to be responsible for more than half the potent antioxidant activity of the juice.”
One detail there is worth knowing as a cook: punicalagin “is most abundant in the fruit husk as opposed to the juicy seeds (arils).” Traditional whole-fruit pressing therefore extracts substantially more of it than carefully de-seeding the fruit would — part of why traditionally made pomegranate products differ from ones made purely from arils.
The buying problem: real pomegranate rob is expensive to produce, and that has made it a documented target for adulteration. Analytical studies have examined commercial pomegranate molasses specifically for dilution with cheaper date syrup and with sugar syrups — high-fructose corn syrup, glucose-fructose syrup and beet sugar syrup — developing spectroscopic methods able to detect these at levels of roughly 1.5–2.5%. Genuine sour pomegranate concentrates in one survey measured around 70–74 °Brix.
What that means practically, since you cannot run a spectrometer at home:
- Read the ingredients. A real rob lists pomegranate (or pomegranate concentrate) and little else. Added sugar, glucose syrup or date syrup near the top of the list tells you what you are actually buying.
- Judge by sourness, not sweetness. Authentic rob anar is sharply, almost aggressively tart. A product that tastes primarily sweet has usually been cut.
- Be suspicious of low prices. Concentrating fruit by a large factor is inherently costly; a cheap bottle is a signal, not a bargain.
Frequently Asked Questions
What is rob in Persian cooking?
Rob is a concentrated Persian fruit paste, made by slowly cooking down fruit until thick and intensely flavored. It’s used as a cooking ingredient, not eaten on its own like jam.
What’s the difference between rob and moraba (Persian jam)?
Moraba (jam) keeps fruit whole or in large pieces in a light syrup and is eaten as-is, often with tea or bread. Rob is a thick, concentrated paste used as a cooking ingredient in stews, marinades, and dressings, not eaten alone.
What is rob anar (pomegranate paste) used for?
Rob anar is the key ingredient in fesenjan (Persian pomegranate walnut stew), and also works well in marinades and salad dressings for a tangy-sweet depth.
How can I tell if pomegranate rob is real or diluted?
Check the ingredient list first — genuine rob is essentially just pomegranate, and date syrup, glucose syrup or added sugar high in the list indicates dilution. Taste is the second check: real rob anar is sharply tart rather than sweet. Adulteration of pomegranate molasses with date and sugar syrups is well documented in the food-science literature, which is also why very cheap bottles are worth treating with suspicion.
What makes pomegranate nutritionally distinctive?
Its dominant polyphenol, punicalagin, is described in the published literature as the largest known molecular weight polyphenol and is reported to account for more than half of pomegranate juice’s antioxidant activity. It is most concentrated in the fruit husk rather than the arils, which is why whole-fruit pressing extracts more of it. This is compositional information, not a health claim.
How much rob should I use in a recipe?
Rob is concentrated, so start with a tablespoon or two and adjust to taste — it’s easy to add more, harder to correct if you use too much at once.
Sources
- Pomegranate Ellagitannins — Heber D., in Herbal Medicine: Biomolecular and Clinical Aspects, 2nd ed. (NIH/NCBI Bookshelf). Punicalagin molecular weight, husk concentration, and antioxidant contribution.
- Food fraud detection in commercial pomegranate molasses syrups by UV–VIS spectroscopy, ATR-FTIR spectroscopy and HPLC methods — Food Control. Documented adulteration of pomegranate molasses with sugar syrups.
- Adulteration of pomegranate molasses with sugar syrups: application of FTIR-ATR spectroscopy and chemometrics — Microchemical Journal. Detection limits for high-fructose corn, glucose-fructose and beet sugar syrups.
This article covers the food science and culinary use of Persian fruit pastes. It is general information, not medical or dietary advice.
Shop the Full Rob Collection
Browse the complete range of authentic Persian rob (also searched as Goldis) at Goaldees, shipped fresh, nationwide across the US. Shop the full Persian rob (fruit paste) collection.
