Kokum: The Sour Purple Rind of India’s Konkan Coast

Along the Konkan coast and in Goa, cooks reach for kokum where others would use tamarind, to make curries, dals and drinks tart. It turns them a deep pink-purple while it’s at it. The sour rind comes from the fruit of Garcinia indica, a tree of India’s west coast, and dried, it’s sold as amsul. It’s also the key ingredient in solkadhi, a refreshing traditional drink, and the seeds give a fat that Goans have used in place of ghee.

At a glance

What kokum is

Garcinia indica is a tree native to western and southwestern India, growing mainly in the seasonally dry tropical biome. It’s widely distributed along the Western Ghats, and its common names include kokum tree, wild mangosteen and goa butter tree.

An article in the Indian Council of Agricultural Research’s Indian Horticulture puts its natural range mainly in the South Konkan region of Maharashtra, plus Goa, northern coastal Karnataka and Kerala. The same article says the tree grows mostly in homestead gardens, often as a rainfed intercrop with coconut and arecanut, and is still largely neglected as a systematic commercial crop.² We didn’t find an official production figure for kokum.

The fruit is usually halved, the seeds removed, and the rind dried. The seeds are a separate product. They contain 23 to 26% edible fat, sold as kokum butter,² which has been used in Goa as an edible fat and a stand-in for ghee.¹

Flavor and the compounds behind it

Kokum gives a tangy, sour flavor, and the rind and dried products taste sweet-sour, with a pink-purple hue. Dried kokum tastes sharply tart, with a fruity, slightly astringent finish. It’s gentler and less sweet than tamarind.

Acids. The review identifies hydroxycitric acid (HCA) as kokum’s major organic acid.¹ The ICAR article adds citric and malic acid, polyphenols and ascorbic acid. Its table of fresh-rind composition reads:²

The table is headed as fresh rind but doesn’t say whether each figure is on a fresh or dry basis, and the values add up to well over 100%, so they can’t all share one basis. Take them as one table’s numbers, not a precise profile.

Color. The review names the main coloring compounds as the anthocyanins cyanidin-3-glucoside and cyanidin-3-sambubioside.¹ The ICAR article gives 1,000 to 2,400 mg of anthocyanins per 100 g of rind.²

Garcinol. The rind is a rich source of garcinol, a benzophenone.¹ It gets studied in the lab for antioxidant and other effects (more under Safety and health claims), but none of the sources we found treats it as a flavor compound.

How kokum is used

The rind is a traditional souring agent in regional cooking, especially vegetarian and seafood dishes. It’s widely used in place of tamarind, in dishes like bhirindi saar, a soup made with kokum juice, and kokum kadi, made by mixing kokum juice with coconut milk.

In the Konkan region of Maharashtra and Goa, the traditional kokum products are:²

• Amsul, the dried rind.
• Agal, a salted juice made by drawing the liquid out of whole fruit with salt.
• Amrut kokum, a syrup diluted into a summer drink.
• Solkadhi, a traditional refreshing drink in which kokum is the key ingredient.

Technique

Soak or simmer a few pieces of dried rind in the dish, and pull them out before serving. Add more if the dish needs more sourness. Go by taste. If a dish ends up too sour, see too much tamarind for ways to rebalance it.

Buying and quality

We didn’t find a grading standard for dried kokum. Dried rind should be dark purple to near black, pliable rather than brittle, and free of mold.

Storage

We found no published shelf-life figure for dried kokum from a regulator or standards body. Keep it in an airtight jar somewhere cool and dark.

Safety and health claims

Kokum has long been valued in Ayurvedic medicine, and its rind juice has traditionally been used for digestive complaints.² The ICAR article lists antidiabetic, anti-obesity and other effects attributed to it, and the review describes garcinol’s activity in the lab.²¹ None of that comes from human trials, and we’re not claiming kokum treats or prevents any condition.

The weight-loss claim deserves a closer look, because hydroxycitric acid is also what Garcinia cambogia supplements are sold for. The pulp and rind of that species’ fruit are high in it.³ NIH’s Office of Dietary Supplements says the effect of Garcinia cambogia on body weight is still uncertain. A meta-analysis found a short-term loss of 0.88 kg compared with placebo, but the effect wasn’t statistically significant when only the two rigorous trials were analyzed.³ ODS also notes reports of 10 cases of liver toxicity linked to supplements containing it, though most involved other ingredients too, so the harm can’t be pinned definitively on Garcinia cambogia.³ Those findings are about concentrated supplements of a different species, not kokum used as a souring spice, and we found no comparable research on culinary kokum.

Substitutes and comparisons

Tamarind is the replacement the review names,¹ and amchur (mango powder) or lime juice can stand in where color doesn’t matter. See kokum substitutes for the ranked list. Other sour spices on this site: sumac and loomi.