Why Does Aubergine Soak Up So Much Oil? And the Fix

Aubergine can absorb several times its own weight in oil within minutes. That is not an exaggeration — half a kilo of fried aubergine can carry a full cup of oil, turning a light vegetable dish into the heaviest thing on the table.

Why it absorbs more than any other vegetable

The flesh of an aubergine has a strange structure: it is a network of cells with a great many air pockets — closer to a sponge than to ordinary vegetable flesh.

When a piece hits hot oil, the air inside expands and escapes, and the space it leaves fills with oil immediately.

And the process is very fast — it happens in the first few seconds, before the surface has even browned.

Salting: it works, for two reasons

Salting is the best-known fix, and it genuinely works — but not for the reason most people think.

First reason: salt draws water out of the cells by osmosis. Cells that lose their water shrink and draw closer together, so the air pockets reduce — meaning less space for oil.

Second reason: salting changes the structure of the cell walls so they become less permeable to oil.

As for the bitterness salt is said to remove — that is overstated. Modern aubergine varieties are barely bitter to begin with, and salt reduces it only slightly; that is not its main role.

The method: cut the aubergine, salt it generously, and leave it in a colander for 30-45 minutes, then rinse it and dry it thoroughly — because any remaining water will evaporate in the oil and make it spit.

Pressing: an extra step that doubles the effect

After salting, put a weight on the slices (a plate with something heavy on it) for 15 minutes.

Pressing expels more water and collapses the air pockets further than salting alone — and the difference in oil absorbed is clearly visible.

Pre-heating: the strongest fix

This reduces oil more than anything else, and fewest people know it.

The idea: if the air pockets have collapsed before the piece touches oil, there is no space for the oil in the first place.

The method: roast the aubergine at 200°C for 15 minutes with no oil at all, or microwave it for 5 minutes.

The heat makes the cells collapse and draw together, and the piece shrinks. Fry it after that and it will absorb a very small fraction of the usual amount.

Frying in very hot oil

Cold oil is the worst thing for aubergine — it absorbs before it browns.

Oil at 190°C browns the surface quickly and forms a crust that reduces absorption.

And plenty of oil beats a little, which is counterintuitive: with too little oil the temperature drops sharply when the aubergine goes in, so it stays cool and absorption increases.

The oven: the cleanest solution

Roasting gives a result very close to frying with a quarter of the oil or less.

The method: cut the aubergine, brush it with oil (do not pour it on), spread it on a tray with gaps between the pieces, and roast at 220°C for 25 minutes, turning halfway.

Brushing distributes a small amount over the whole surface, whereas pouring lets some pieces drink all the oil.

The difference between varieties

• Large globe aubergine: more pockets so it absorbs more, and more seeds too.
• Small local aubergine: denser and less absorbent, and better for frying.
• Long thin (Asian) aubergine: the least absorbent and the most tender — best for a quick sauté.

The rule: the smaller and denser it is, the less it absorbs.

Choosing aubergine at the market

A good aubergine feels heavy for its size, with shiny, taut skin and a fresh green stem.

A light aubergine has lost water and its pockets have widened — meaning it will absorb more oil.

And a light press should spring back. If the mark stays, it is old and its seeds will be hard and bitter.

Storage

Aubergine is sensitive to deep cold — a very cold fridge pits the skin and softens the flesh.

Best: a cool spot outside the fridge if it will be eaten within two days, or the vegetable drawer for longer.

And do not cut it before use — the flesh oxidises and darkens within minutes. If you must, put the pieces in salted or acidulated water.

The dishes that depend on it

Moussaka, makdous, baba ghanoush, ratatouille and vegetable bakes all need the oil handled correctly.

And baba ghanoush is the exception: its aubergine is charred over a flame rather than fried, so there is no oil problem at all. The only fat in it is the olive oil added at the end.

Practical summary

If you are frying: salt for 30 minutes, press, dry thoroughly, plenty of oil at 190°C.

If you want as little oil as possible: roast it for 15 minutes with no oil first, then fry — that cuts the absorption to a quarter.

And if you want the cleanest solution: the oven entirely, with the oil brushed on.