Cold pressed mustard oil has a strong, pungent character that either defines a dish or overwhelms it, depending on how it's used and how it was made. If you're trying to buy the right bottle and actually get the most out of it in the kitchen, here's a practical guide covering both.
What Makes Mustard Oil "Cold Pressed"?
Cold pressed mustard oil is extracted mechanically, using pressure rather than heat or chemical solvents, with the temperature during pressing kept low, generally under 49 degrees Celsius. In India, this method is often specifically called "kachi ghani" when done using a traditional rotary mill, though the broader term "cold pressed" covers both ghani-extracted and modern screw-press mustard oil, as long as the low-heat principle holds.
Why the extraction method matters for mustard oil specifically
Mustard oil's characteristic pungency comes from compounds called glucosinolates, which convert to allyl isothiocyanate when the seed is crushed. Slower, cooler extraction tends to preserve more of this natural sharpness and aroma compared to high-heat expeller pressing, which is part of why cold pressed mustard oil smells and tastes noticeably stronger straight out of the bottle.
How to Choose a Good Cold Pressed Mustard Oil
Check the label, not just the front of the bottle
- Look for "cold pressed" or "kachi ghani" stated explicitly, not just implied by packaging design or color.
- Check the FSSAI license number printed on the label, a basic marker of a registered, traceable producer.
- Read the ingredient list, it should say 100 percent mustard oil, with nothing else blended in.
Color, clarity, and smell
Genuine cold pressed mustard oil is typically a deep amber to reddish-brown color and has a sharp, pungent smell that can make your eyes water slightly when opened, similar to raw mustard itself. Oil that smells flat, overly mild, or faintly rancid is worth reconsidering.
Packaging
Mustard oil degrades faster when exposed to light, so oil sold in dark glass bottles or tins tends to hold its quality better over time than oil sold in clear plastic bottles left on a bright shelf.
How to Use Cold Pressed Mustard Oil in Cooking
Tempering and everyday cooking
For most Indian cooking, mustard oil is heated until it reaches its smoke point and starts to shimmer slightly, letting some of the raw pungency cook off before adding whole spices, onions, or vegetables. This step matters more with cold pressed oil than with refined oil, since the raw aroma is stronger to begin with.
Pickling
Mustard oil is a traditional base for Indian pickles because its natural pungency acts as a mild preservative alongside salt and spice. It's typically used without heating for this purpose, or lightly heated and cooled first to soften the rawest edge of the aroma before mixing with vegetables or fruit.
Hair and skin use
Mustard oil is also commonly used outside the kitchen, for hair oiling or as a massage oil, a traditional practice in many Indian households. This isn't a medical claim, just a common household use worth knowing if you're buying a bottle for reasons beyond cooking.
Storage
Keep the bottle tightly sealed, away from direct sunlight and heat, ideally in a cool cabinet rather than next to the stove. Cold pressed oils, since they skip some of the stabilising steps used in refined oil, benefit more from being used within a few months of opening rather than sitting half-used for a year. If you notice the oil turning cloudy or developing a flat, stale smell over time, that is usually a sign it has been exposed to too much light, heat, or air, and it is worth replacing rather than continuing to use.
If you're looking for a bottle that fits this description, Rulife's cold pressed mustard oil is extracted using low-heat mechanical pressing, without added heat or solvents, and comes with the pungency and color typical of the traditional method.
From Rulife: cold pressed mustard oil · cold pressed oil. Free shipping above ₹599.
Kachi ghani, cold pressed, expeller pressed: what the terms mean
Three words get used almost interchangeably on Indian oil labels, and only one distinction really matters.
Kachi ghani literally means ‘raw grinding’ — seed crushed cold in a traditional ghani or kolhu, with no heat applied. Cold pressed is the general English term for the same idea: mechanical extraction without added heat. Expeller pressed is a modern steel screw press; it is still mechanical, but the speed generates friction heat, so the oil comes out warmer.
| Kachi ghani / cold pressed | Expeller pressed | Refined | |
|---|---|---|---|
| Method | Slow wooden ghani | Fast steel screw press | High heat, often a solvent wash |
| Temperature | Below ~40°C | Warm from friction | High |
| After pressing | Filtered, bottled | Filtered, sometimes refined | Bleached and deodorised |
| Pungency | Sharp | Reduced | None |
| Yield | Lowest | Higher | Highest |
The yield row explains the price. A ghani leaves oil in the cake that the other two methods force out, and you are paying for the litres it leaves behind along with the aroma and vitamin E that refining removes.
Spotting genuine kachi ghani oil
It should sting your nose. Pungency in mustard oil comes from natural glucosinolates in the black seed, and refining strips them out, so bland mustard oil has been processed whatever the label says. It should also be deep amber and slightly cloudy, with sediment settling over time — both normal, neither a defect.
Our own oil and how it is pressed is at cold pressed mustard oil, and the method is written out on the Quality & Sourcing page.
FAQs
1. Is cold pressed mustard oil good for daily cooking?
Yes, it's a staple cooking oil across much of North and East India, used for everything from daily sabzi to deep frying, once it's been heated to cook off some of the raw pungency.
2. Why does cold pressed mustard oil smell so strong?
The sharp smell comes from compounds released when mustard seeds are crushed, and slower, low-heat extraction preserves more of this natural pungency compared to high-heat processing methods.
3. Can this oil be used without heating first?
It can, particularly for pickling or finishing a dish, but the raw pungency is much stronger unheated, which is why most cooking applications call for heating it first.
4. How long does an opened bottle last?
Stored properly, away from heat and light, it generally stays good for several months, though it's best used within 3-4 months of opening for the best flavor and quality.
5. Is cold pressed mustard oil the same as kachi ghani mustard oil?
Kachi ghani mustard oil is a specific type of cold pressed mustard oil made using a traditional rotary mill. All kachi ghani oil is cold pressed, though cold pressed mustard oil can also come from modern low-heat screw presses.
6. Does it need refrigeration?
No, it doesn't need refrigeration. A cool, dark cupboard away from the stove's heat is sufficient for storage.
Conclusion
Cold pressed mustard oil earns its reputation through a slower, low-heat extraction process that keeps its natural pungency and color intact, but getting the best out of a bottle depends on checking the label, storing it properly, and knowing how to heat it before cooking. Whether you're using it for daily meals, pickling, or outside the kitchen entirely, those basics apply across the board.
About the author. The Rulife Team works directly with the farms, ghani units and bilona kitchen behind our oils and ghee in Karwar, Karnataka. We write about what we can see in the press room and verify in the lab, and we say so plainly when the evidence is thinner than the marketing. How our products are made →
