There is one number that gets quoted more often than any other when an oil is sold: the smoke point. It is also one of the most misunderstood numbers in the kitchen. This is a short guide for the household — what smoke point is, what it is not, and which of our five oils belongs at which heat.
What smoke point actually measures
The smoke point of an oil is the temperature at which it begins to break down visibly — releasing thin blue smoke and a sharp odour. At that temperature the oil’s structure starts to come apart. Free fatty acids form. Glycerol becomes acrolein. Flavour turns acrid. Past the smoke point, the oil is no longer doing the job it was put in the pan to do.
It is a temperature, not a verdict. An oil with a 175°C smoke point is not “worse” than one with 250°C. It is suited to different heat.
The chart — our five oils
| Oil | Smoke point (cold-pressed) | Best uses |
|---|---|---|
| Mustard | 250°C | Tadka, deep fry, fish curry, achaar, finish |
| Groundnut | 230°C | Fry, sauté, kadhai work, neutral-flavour cook |
| Sesame | 210°C | Tadka, low-heat finish, dressing, dal tarka |
| Coconut | 175°C | Sauté, low-heat curry, baked goods, hair and skin |
| Deepam (lamp) | n/a | Not for cooking — for the diya |
The numbers are for our own cold-pressed oils, taken at the press. A refined oil of the same seed will read higher — the volatile compounds that smoke first have already been stripped out. That is not an upgrade; it is a different product.
Matching the oil to the heat
Indian cooking is mostly a story of three heats — the high snap of a tadka, the medium hold of a sauté or fry, and the low finish of a dressing or low-heat curry. Pick the oil for the heat the pan will actually see, and the question of smoke point answers itself.
The tadka snap — 200–230°C
Tadka — the brief tempering of whole spices in hot oil that opens a dal, a sabzi, a raita — is the highest heat the home kitchen reaches. The oil goes into a dry kadhai, comes up to its first wisp of smoke, takes the cumin or mustard seed for fifteen seconds, and the heat is off.
Mustard oil and sesame oil are the two classical tadka choices. Mustard for the North and East — sarson with cumin, dried red chilli, garlic, hing. Sesame for the South — til oil with mustard seed, curry leaves, urad dal. Both have enough headroom above tadka temperature that the oil itself does not burn. Both carry the spice profile the way the kitchen wants.
Groundnut works fine for tadka where you want a neutral carrier — when the dish is otherwise loud and the oil should sit back.
The fry — 180–220°C
Sustained heat for fritters, kachoris, fish, samosas, the long pan-fry of a stuffed paratha. The oil sits in the pan for ten or fifteen minutes at a time, returning to temperature between batches.
Groundnut is the workhorse here. Its flavour is mild enough to stay out of the way, its smoke point is comfortably above frying temperature, and it does not foam or break down on the second batch. Mustard oil also frys cleanly — it is what Bengali fish kitchens have always used — but its character is louder.
Coconut oil for frying is regional. In Kerala, banana chips and pazham pori go into hot coconut oil and come out tasting of coconut. Outside that tradition, it is too low a smoke point and too distinct a flavour for general frying work.
The sauté and low-heat curry — 120–180°C
Onion-tomato base, slow caramelisation, the long simmer of a curry where the oil sits in the gravy at 140°C or so. The oil’s character matters here because it becomes part of the gravy.
All four cooking oils work at this heat. Pick by cuisine and instinct:
- Mustard for Bengali, Punjabi, Odia. Heat to smoking first, then drop the temperature — that releases the round, sweet character.
- Groundnut for Maharashtrian and Gujarati. Neutral carrier.
- Sesame for Tamil, Andhra, Telangana — the South Indian sauté, the carrier for curry leaves and asafoetida.
- Coconut for Malayali, Konkani, Mangalorean coastal. Stays below its smoke point at this heat, contributes its sweet finish.
The finish — under 100°C
Drizzle on a dal at the table. A salad dressing. The slick on top of a freshly tempered raita. A spoonful into a baby’s khichdi. Here smoke point is irrelevant — the oil is below cooking temperature entirely. What matters is flavour and provenance.
This is where cold-pressed earns its keep. A refined oil at this temperature is decoration. A cold-pressed mustard finish on a winter dal is the dish.
Three things smoke point does not tell you
Once the heat question is settled, the rest of the choice is made on three things smoke point cannot speak to.
Oxidative stability. How long the oil stays good once heated. Cold-pressed oils with intact antioxidants — sesame’s sesamin, mustard’s natural phenolics — resist oxidation longer than refined oils of the same seed, even when refined oils have higher smoke points. For repeated frying, this matters more than the smoke point itself.
Flavour direction. Two oils with the same smoke point can pull the dish in opposite directions. Groundnut at 230°C and mustard at 250°C are useful for similar heat windows, but a fish curry made in groundnut tastes flat next to one made in mustard. The oil is a flavour, not just a medium.
The fat profile. What the oil leaves behind in the body once you have eaten it. Mustard is high-MUFA. Coconut is high-SFA with a distinct medium-chain fatty acid profile. Sesame is balanced and rich in tocopherols. These are not smoke point questions.
The summary, on one line
For tadka and fry, mustard or groundnut. For low-heat South Indian cook, sesame. For coastal sauté, coconut. For finish on anything, cold-pressed mustard.
The smoke point of an oil is a useful number. It is not the only number. The kitchen has been choosing oils by flavour and intent for longer than anyone has measured the temperature at which they smoke.
Since 1965. Unchanged on purpose.