India does sour better than almost anywhere. Kokum sherbet on the Konkan coast, a kala khatta gola on a Mumbai beach, gondhoraj lebur shorbot in Kolkata, amla murabba in a North Indian pantry, and imli in almost every chaat. These five flavours taste "sour", but they come from very different fruits and behave very differently. Here is what each one is, when it is in season, and why sour feels so refreshing.
💧 Why sour tastes refreshing
Sourness makes the mouth water, literally. A 1984 study in Physiology and Behavior found that both perceived sourness and saliva flow rose as acidity rose. A 1988 study in Archives of Oral Biology found that citric acid produced the highest whole-saliva flow of the foods tested, increasing with concentration. That fresh, thirst-quenching feeling of a cold kokum soda or nimbu pani starts in the mouth.
🍇 The five sour fruits at a glance
| Fruit | What it is | Sour style | Season or form | IFCT 2017 note (per 100 g) |
|---|---|---|---|---|
| 🟣 Kokum | Garcinia indica, native to India | Fruity, tangy, deep red-purple | Fruits April-June; rind, syrup, sol kadhi | Not listed |
| ⚫ Kala khatta | A jamun-based flavour, sweetened and spiced | Sweet-tart, salty, purple-black | Syrups, golas, coolers | Not listed |
| 🍋 Gondhoraj | Gandharaj lemon, Citrus × limon | Sharp, very fragrant rind | West Bengal lemon | Not listed |
| 🟢 Amla | Indian gooseberry | Sour, astringent, slightly bitter | Fresh, murabba, candy, juice | Vitamin C about 252 mg |
| 🟤 Imli | Tamarind pulp | Sour and sweet together | Dried pulp year-round | Carbohydrate about 67 g; vitamin C about 3.6 mg |
IFCT values are from ICMR-NIN's Indian Food Composition Tables 2017. For comparison, IFCT lists lemon juice at about 48 mg of vitamin C per 100 g.
🟣 Kokum: the Konkan coast's cooler
ICAR-Central Coastal Agricultural Research Institute describes kokum (Garcinia indica) as an important fruit and spice tree native to India, growing in humid tropical areas and bearing fruit from April to June. Its post-harvest products include amrut kokum, agal, sol kadhi, kokum butter, ready-to-serve drinks and rind powder. The fresh rind gives the famous deep red-purple colour.
⚫ Kala khatta: jamun, sweetened and spiced
The name means "black sour". NDTV Food describes the flavour as derived from jamun, sweetened and often seasoned with black salt, lemon and roasted cumin. Slurrp notes that the gola version is commonly made with a store-bought syrup. So the flavour is jamun-led, but a bottle labelled kala khatta is not always made from jamun. Read the ingredients list. Our jamun guide covers the fruit itself.
🍋 Gondhoraj: the fragrant Bengal lemon
A 2020 study in Botanica Pacifica describes Gandharaj lemon as Citrus × limon, cultivated in many areas of West Bengal, with ellipsoidal yellow fruit. Its appeal is aroma as much as acid, carried by the fragrant rind, and it now appears beyond Bengal in café refreshers.
🟢 Amla: sour, astringent and rich in vitamin C
IFCT 2017 lists Indian gooseberry at about 252 mg of vitamin C per 100 g, about five times the figure for lemon juice, along with 87% moisture and about 7.8 g of dietary fibre. Its taste is sour first, then astringent. It is widely eaten as murabba, candy and juice. For a festive amla pairing, see our Fruit Combo of the Day with amla and honey.
🟤 Imli: the sweet-sour pantry staple
Tamarind pulp is a dried, concentrated fruit. IFCT 2017 lists it at about 21% moisture with about 67 g of carbohydrate per 100 g, which is why imli tastes sweet and sour at the same time. It is the backbone of saunth chutney, rasam and many chaat masalas, and it carries far less vitamin C than amla or lemon (about 3.6 mg per 100 g).
☕ Where sour is trending in 2026
Restaurant India reported in May 2026 that Indian cafés are building seasonal menus around regional flavours, naming aam panna coolers, gondhoraj lemon refreshers and kokum sodas among them, alongside cafés cutting sugar in drinks. Sour fruits suit that shift: acidity carries flavour, so a drink can taste bright with less sugar.
Kokum, kala khatta, gondhoraj, amla and imli are all "sour", but they are five different fruits: a coastal Garcinia, a jamun flavour, a fragrant Bengal lemon, a vitamin C-rich gooseberry and a sweet-sour dried pulp. Sourness makes the mouth water, which is why each one feels refreshing in a cold drink.
This article is general information, not medical advice.
Sources
- ICMR-NIN: Indian Food Composition Tables 2017
- ICAR-CCARI: Kokum crop information
- Botanica Pacifica, 2020: Floral ecology, floral visitors and breeding system of Gandharaj lemon (Citrus × limon)
- Norris et al., Physiology and Behavior, 1984: Human saliva and taste responses to acids varying in anions, titratable acidity, and pH
- Watanabe and Dawes, Archives of Oral Biology, 1988: The effects of different foods and concentrations of citric acid on the flow rate of whole saliva in man
- NDTV Food: If you love kala khatta, these jamun popsicles will be your new obsession
- Slurrp: Kala khatta gola
- Restaurant India, May 2026: How cafés are experimenting with seasonal beverage menus
Hero photo: "Garcinia indica - fruits, seeds, pulp and rinds" by Subray Hegde, Wikimedia Commons, CC BY 1.0. See Credits.
Questions
What is kala khatta made from?
Kala khatta means 'black sour'. NDTV Food describes the flavour as derived from jamun, sweetened and often seasoned with black salt, lemon and roasted cumin. Slurrp notes that many gola stalls use a ready-made syrup, so the flavour in a cup may or may not contain real jamun. Check the label if you are buying a bottled syrup.
Which sour Indian fruit has the most vitamin C?
Among the fruits here, amla. Indian Food Composition Tables 2017 list Indian gooseberry (amla) at about 252 mg of vitamin C per 100 g, lemon juice at about 48 mg and tamarind pulp at about 3.6 mg. Kokum and gondhoraj are not listed in IFCT 2017.
Why do sour drinks feel so refreshing?
Part of the answer is saliva. A 1984 study in Physiology and Behavior found that perceived sourness and saliva flow both rose with acidity, and a 1988 study in Archives of Oral Biology found citric acid gave the highest whole-saliva flow among the foods tested, rising with concentration. A cold, sour drink therefore feels thirst-quenching even before you swallow.
When is kokum in season?
ICAR-Central Coastal Agricultural Research Institute in Goa says kokum (Garcinia indica) bears fruit from April to June. Out of season you will meet it as dried rind (agal), amrut kokum syrup, sol kadhi or ready-to-serve drinks.
Is gondhoraj the same as a regular lemon?
It is a lemon, but a distinctive one. A 2020 study in Botanica Pacifica describes Gandharaj lemon as Citrus × limon, cultivated in many areas of West Bengal, with yellow, ellipsoidal fruit. It is prized for its fragrant rind, which is why Bengali menus use it in sherbets and cafés use it in refreshers.
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