What extra virgin olive oil actually means, and what it does not guarantee

Extra virgin is not a designation of origin, not a quality mark, and says nothing about where the olives grew. It is the first of the categories European law uses to classify olive oil.

The others are virgin olive oil; lampante, which cannot be sold to consumers as it is; and plain «olive oil», which is a blend of refined and virgin oil. These are legal definitions, not marketing ones. An oil either meets the parameters or it does not, and printing extra virgin on one that does not is an offence.

The most quoted parameter is free acidity, expressed as oleic acid. For extra virgin the limit is 0.8 g per 100 g. Virgin olive oil goes up to 2. Above 2 the oil is lampante and cannot reach the consumer in that state.

Here the commonest misunderstanding needs clearing up: acidity is not a taste. You cannot detect it in the mouth and it has nothing to do with the peppery catch at the back of the throat, which comes from polyphenols. It is a laboratory figure, and it measures how far the fats have degraded: it rises when olives arrive bruised, diseased or picked off the ground, when they sit too long before milling, when the paste is worked too warm.

So acidity tells you how the olives were handled between the tree and the mill. It is a measure of process hygiene, and worth knowing for that. It is not a measure of flavour.

Alongside acidity the rules set further chemical parameters, from peroxide value to ultraviolet absorbance, designed to catch oxidation and blending with refined oils. These are checks nobody can run at home.

The part almost nobody mentions is that extra virgin is not decided in the laboratory alone. A sensory assessment is also required, the panel test: a group of trained tasters evaluates the oil by a codified method, from dark glasses so that colour cannot sway the verdict.

Two things are needed together: no perceived defect, and a fruity note present. Typical defects are fustiness, when olives have fermented while waiting, mustiness, winey-vinegary notes, rancidity. If a defect appears, the oil drops a category even with acidity well within range.

This changes how the label should be read: extra virgin is not one threshold to clear but two exams to pass, one instrumental and one human.

Extra virgin is a floor, not a certificate of excellence, and it is silent on three things many people assume it covers.

It does not state origin. An oil can be extra virgin and come from olives of several countries; the label must then say so, with wording such as «blend of olive oils of European Union origin». «Bottled in Italy» does not mean Italian olives.

It does not state the crop year, unless the best-before date hints at it, and olive oil does not improve with age. It is the opposite of wine.

It does not state flavour. Two oils both within the rules can sit enormous distances apart in bitterness, pungency and fruitiness. Those differences are real and no legal parameter describes them.

For a further layer of guarantee there are the protected designations, PDO and PGI, which add to the legal minimum a specification covering area, cultivar and method.

First, the origin of the olives, which is compulsory: Italian, European Union, non-EU, or the mixed wordings. It is the single figure that most distinguishes two apparently identical bottles.

Second, the best-before date, which lets you work backwards and judge how old the oil is. The further away it sits, the more recent the harvest.

Third, where present, the stated crop year. It is not compulsory, and careful producers tend to print it.

On acidity there is only one thing worth saying: when it appears on a label it is voluntary information, and should be read for what it is, a process figure. It does not promise the oil is good. It promises the olives were handled well.