If you have ever stood near a working oil press and watched a thick, golden stream emerge from crushed seed, you have seen the idea behind marachekku oil. It is one of the oldest ways of getting oil out of a seed, slow, mechanical, and refreshingly simple. This guide explains what the word means, how the press works, and how to tell a genuine wood-pressed oil from a refined commodity oil.
What "marachekku" means
"Marachekku" is a Tamil compound word: mara means wood, and chekku means press. So a marachekku is, quite literally, a wooden press. The same device is known across India by other names, the chekku in Tamil, the ghani in much of north India, and the kolhu elsewhere.
Whatever you call it, the heart of the machine is the same: a large wooden mortar with a wooden pestle that turns inside it, slowly crushing oilseed against the walls until the oil seeps out. Historically the pestle was turned by a pair of bullocks walking in a patient circle; today it is just as often driven by a slow electric motor. Mortar-and-pestle oil extraction of this kind is ancient, a Sanskrit reference to an oil-press dates to roughly 500 BC, which makes the chekku one of the oldest oil-pressing methods in India.
How a wooden chekku actually works
The mechanics are unhurried by design. Cleaned, dried oilseed, coconut copra, groundnut or sesame, for example, is loaded into the wooden mortar. As the pestle rotates, it grinds and presses the seed against the inner wall. The friction and pressure break open the oil-bearing cells, and the oil collects and drains away, leaving behind a solid cake of crushed seed.
- It is mechanical. The oil is pressed out by physical force, not coaxed out with chemicals.
- It is solvent-free. There is no hexane or other solvent involved, unlike much commodity oil extraction.
- It skips refining. Wood-pressed oil is not put through the refining, bleaching and deodorising steps that commodity oils go through, so it keeps its natural colour, aroma and flavour and is sold unrefined.
- It leaves a useful by-product. The leftover oil-cake, known as punnakku, is traditionally used as cattle feed and as natural fertiliser.
The press itself is traditionally built from vagai (Albizia lebbeck), a hard, dense, durable native hardwood. Vagai is one of several traditional woods used for these press mortars and pestles, it is valued for its toughness rather than being the only wood a chekku can be made from.
Wood-pressed vs cold-pressed vs refined (in brief)
These three terms get muddled often, so here is the short version.
- Wood-pressed (marachekku): oilseed crushed in a wooden press, mechanically and without solvents, then sold unrefined.
- Cold-pressed: a true process description for oil pressed at low temperature without external heat applied. Worth knowing: "Cold Pressed" is not a separate FSSAI-certified grade for coconut, groundnut or sesame oil, that labelling is defined only for mustard oil. For other oils, it describes the method, not a legal certification.
- Refined: oil that has been extracted (often with solvents) and then refined, bleached and deodorised. This produces a neutral, pale, long-lasting oil with a higher smoke point, but the natural colour, aroma and flavour are stripped out along the way.
For a fuller side-by-side, see our companion guide on wood-pressed versus refined oil.
What you gain (and give up)
An honest answer has two sides. What you gain with wood-pressed oil is character: the natural colour, the aroma and the flavour of the seed itself, pressed mechanically and without chemical refining. What you give up is the convenience of a neutral, high-heat commodity oil.
The most practical trade-off is in the kitchen. Unrefined oils have lower smoke points than refined oils. That makes wood-pressed oils well suited to tempering, sautéing and medium-heat cooking, and less suited to sustained high-heat deep frying. They are a cooking choice, not a frying-everything choice.
A few storage and handling points are worth keeping in mind too:
- Unrefined oils oxidise faster than refined ones, so store them away from light, heat and air.
- Wood-pressed coconut oil solidifies below about 24°C, that is normal and not a sign of spoilage.
- Groundnut (peanut) allergen note: unrefined groundnut oil retains peanut proteins and is not safe for anyone with a peanut allergy. Always check before sharing food made with it.
How to spot genuine wood-pressed oil
Because "wood-pressed" and "cold-pressed" are not always policed on a label, it helps to know what genuine oil tends to look, smell and behave like.
Aroma and colour
Genuine wood-pressed oil keeps the natural colour and the distinct aroma of its seed, sesame smells nutty and toasty, groundnut smells unmistakably of peanuts. A perfectly clear, odourless, pale oil has usually been refined.
Natural sediment
A little natural settling or cloudiness at the bottom of the bottle is normal for an unrefined oil. It has not been filtered to a polished clarity.
Sold unrefined, with a lower smoke point
An honest wood-pressed oil is sold as unrefined and will have a lower smoke point than a refined equivalent. If a seller promises a wood-pressed oil that behaves like a high-heat refined oil, treat that as a red flag.
An honest seller
Perhaps the most reliable signal is the seller themselves. Look for plain talk about how the oil is pressed and sourced, sensible storage advice, and a clear allergen note on groundnut oil, rather than sweeping health claims. You can read how we press and source on our Our Method page.
A short FAQ
Is marachekku oil the same as cold-pressed oil?
Broadly, yes, both describe mechanical, low-temperature pressing without solvents or refining. "Marachekku" specifically points to a wooden press. Remember that "cold pressed" is a process description for coconut, groundnut and sesame oils, not an FSSAI-certified grade (that label applies only to mustard oil).
Is wood-pressed oil pressed with no heat at all?
No. The grinding action of the chekku creates some friction heat, so it is better described as slow, low-temperature pressing rather than a heat-free process.
Can I deep-fry with wood-pressed oil?
It is better kept for tempering, sautéing and medium-heat cooking. Because unrefined oils have lower smoke points than refined oils, they are not the right choice for sustained high-heat deep frying.
Why is my wood-pressed coconut oil solid?
Coconut oil naturally solidifies below about 24°C. That is normal and not a sign that anything is wrong with it.