Puglia produces more olive oil than any other region in Italy. Drive twenty minutes in almost any direction from here and you are among olive trees, some of them old enough that nobody can say who planted them or when.
And yet most visitors go home with a bottle chosen for its label. This is what actually happens between the tree and the tin, what the words on the bottle mean, and how to tell in ten seconds whether an oil is alive or merely old.
The harvest is a decision, not a date
Olives ripen from green through purple to black, and they can be picked at any point along that line. The choice changes everything that follows, and it is the single biggest reason two bottles on the same shelf cost such different amounts.
Early, green, and expensive
Picked early, while the fruit is still green and hard, olives give much less oil per kilo. Somewhere between a half and a third of what the same tree would yield a month later. That oil is intensely green, bitter and peppery, and loaded with polyphenols, the compounds responsible both for the sensation in your throat and for most of the health claims made about olive oil.
It also keeps better, because those same compounds are antioxidants and slow the oil's decline.
Late, black, and mild
Picked late, when the fruit is soft and dark, the same trees give far more oil, milder and rounder, easier to like immediately and with much less of everything else. It is not a fraud and it is not bad oil. It is a different product, made from the same fruit by waiting.
Once you know this, the price question answers itself. An early-harvest oil costs the producer two or three times as much per litre to make. If a bottle is cheap, somebody waited.
From tree to mill, in hours
The moment an olive leaves the tree it begins to ferment. The clock that matters is the one between the net on the ground and the mill, and good producers measure it in hours. Twelve is fine, twenty-four is acceptable, three days is a defect you will taste as a musty, winey note that professionals call riscaldo.
What happens inside the mill
- Washing and de-leafing. Dust and leaves out, because both carry flavours nobody wants.
- Crushing. The whole fruit, stones included, is ground to a paste. Stone wheels once did this; steel hammers usually do it now, faster and cooler.
- Malaxation. The paste is stirred slowly for twenty to forty minutes. This is the step that decides the character of the oil: the microscopic droplets find each other and coalesce, and the aromas either survive or do not.
- Separation. Traditionally by pressing the paste through mats; now almost always by centrifuge, which is cleaner, quicker and leaves less residue.
- Settling and filtering. New oil is cloudy with water and fragments. Some producers filter, some let it settle. Unfiltered oil tastes wonderful young and deteriorates faster.
What "cold extraction" actually refers to
The temperature of the malaxation. Keep it below about twenty-seven degrees and you keep the volatile aromas and the bitter compounds; let it rise and you extract more oil from the same paste, but flatter and shorter-lived.
The phrase on a label is regulated and means that threshold was respected. It is not marketing, though it is often printed as though it were the only thing that matters, which it is not.
Nothing is ever added. Extra virgin olive oil is fruit juice, obtained by mechanical means alone, which is a strange thing to say about something you fry in and the most useful fact about it.
The old stone wheels
You will see them everywhere here: huge limestone discs propped against walls, set into gardens, used as tables. They turned in a stone basin, crushing the fruit under their own weight, and many of the old mills were cut into the rock underground, because a constant temperature suited the paste and the winter cold above ground did not.
Almost nobody works that way now, and a modern mill genuinely makes better oil: faster, cleaner, cooler, with less contact with air. The wheels survive as ornaments and as a reminder of how much labour a litre used to cost.
Worth knowing what they were. Worth not mistaking a picture of one on a label for a sign of quality.
Reading a label
The four things that matter
- The harvest year. Olive oil does not improve with age; it declines from the day it is made. Fresh is better, always. A bottle that does not tell you when the olives were picked is hiding something ordinary. The "best before" date is not the same information.
- Where it was milled, precisely. A place, not a region. "Packed in Italy" or "bottled in Italy" is a statement about a factory, and the oil inside may have been grown anywhere in the Mediterranean.
- The cultivar. Coratina, Ogliarola, Peranzana, Cellina di Nardò, Leccino. These are varieties, and they taste as different from one another as grapes do. A producer who names the variety is telling you they know exactly what they picked.
- Dark glass, or a tin. Light destroys olive oil quickly. A beautiful clear bottle standing in a sunny window is a bad sign about the shop as much as about the oil.
Two things that matter less than people think
Acidity. Extra virgin must be below 0.8 per cent free acidity, and good producers are far below it. But acidity is tasteless: it is a laboratory measure of damage, not a measure of quality, and a very low number on a bottle tells you the fruit was healthy, not that the oil is good.
Colour. Green or golden tells you about the cultivar and the ripeness, nothing about the quality. Professional tasting glasses are coloured blue precisely so the taster cannot see it.
The cultivars you will meet here
- Coratina. The great Apulian variety, from around Corato in the north. Very high in polyphenols, aggressively bitter and peppery young, and it keeps longer than almost anything else. Often blended to soften it.
- Ogliarola. Gentler, more almond and grass, widespread through the centre of the region.
- Peranzana. From the north-west, delicate and faintly sweet, popular with people who find Coratina too much.
- Cellina di Nardò. A Salento variety, and one of those hit hardest by the last decade.
How to taste it
Pour a little into a small glass, cup one hand over the top and warm the base with the other for a moment. The warmth lifts the volatile compounds, which is the entire trick.
Smell it first. It should smell green: cut grass, artichoke, tomato leaf, green almond, sometimes apple. If it smells of nothing, it is tired. If it smells waxy, like crayons, or of damp cardboard, it is faulty, and that fault is common enough in supermarket oil that most people have never tasted a good one.
Then take a small sip and draw air across it through your teeth, which sounds absurd and aerosolises the oil across the back of the mouth. Two sensations tell you it is alive:
- Bitterness across the middle and back of the tongue, arriving immediately.
- A peppery catch at the back of the throat, arriving a second or two later and often making people cough the first time.
Both come from polyphenols, both fade as the oil ages, and both are good. In Puglia a strong oil is sometimes described by how many coughs it provokes. Their absence is not smoothness. It is age.
The trees are having a hard decade
It is worth saying plainly rather than leaving it out of a cheerful article. A bacterium, Xylella fastidiosa, arrived in the south of Puglia and has killed an enormous number of olive trees, many of them centuries old. Whole landscapes in the Salento have changed from silver-green to grey.
The Valle d'Itria, where we cook, sits north of the worst of it and the groves here are still standing. Containment, replanting with resistant varieties and research continue, and the picture is not uniformly bleak, but it is not over either.
What this means for a visitor is small but real: nobody in this region talks about olive trees casually any more. If a producer starts telling you about grafting and resistant cultivars, they are not making conversation with a tourist.
Buying it here
Buy at a mill, a frantoio, or at a farm shop attached to one. Many sell directly, many will let you taste first, and the price is usually lower than the supermarket for something several classes better.
Ask three questions: when were the olives picked, which variety, and was it milled here. Three straight answers and you are in the right place. Vagueness on any of them, especially the third, and you are in a shop that buys in bulk and relabels.
On quantity: a five-litre tin is the local unit and the best value, and it travels perfectly well in a suitcase inside a bin bag. Decant it at home into a smaller dark bottle for daily use and keep the tin closed and cool.
Once you get it home
- Dark, cool, sealed. A cupboard, not the windowsill, and never beside the hob, which is where almost everyone puts it and the worst place in the kitchen.
- Not the fridge. It clouds and solidifies, which harms nothing but achieves nothing either.
- Use it inside a year of the harvest, and preferably within six months of opening.
- Cook with it. The idea that good oil must not be heated is largely a myth; its high polyphenol content makes it more stable than most seed oils. Keep the very best for raw use because that is where you taste it, not because heat is a crime.
Above all, use it. A tin kept for a special occasion is a tin quietly getting worse. Good oil belongs on the Tuesday plate of beans as much as on the Sunday roast, and a year from now it will be a memory of a holiday rather than the thing itself.
See a harvest, if you can
Autumn is when the nets go down and the mills run day and night, and the whole region smells faintly of crushed fruit. Standing in a mill while the first oil of the year comes out, still cloudy, still warm, on a piece of bread, is not something a bottle can reproduce.
We take guests to the producers we buy from, mills included, and the day the new oil arrives is the best day of our working year.