01The label is doing a lot of work — here's how to read it
Extra-virgin means the oil was extracted without heat or chemicals and passed an acidity test below 0.8 percent. That single phrase is the most important thing on the bottle. Everything below it — harvest date, estate name, variety — is useful context; anything above it on a competing label that lacks those words is a lesser product, full stop.
The distinction that actually changes how you shop is cooking oil versus finishing oil. For high-heat sautéing, roasting or building a pan sauce, a mid-range supermarket extra-virgin is fine — you'll drive off the delicate aromatics anyway, so spending more is wasted. Save a genuinely good oil for the moments it stays raw: drizzled over white beans, pooled in a soup bowl, finishing a piece of fish. Those are the situations that reward the better bottle.
On the label, look for a harvest date rather than a best-before date alone. Olive oil doesn't age well — it oxidises and goes flat, sometimes rancid. A harvest date tells you the oil's age; best-before only tells you the producer's optimism. Aim to use oil within roughly eighteen months of harvest. If there's no harvest date and the price is suspiciously low, assume the oil has been sitting around.
The tin deserves its own argument. Large tins — three litres, five litres — are how professional kitchens buy olive oil, for good reason: the price per litre drops significantly, and the tin blocks out light, which is one of the main causes of deterioration. Decant what you need into a small dark-glass bottle for the counter and keep the rest sealed. It's a small habit that keeps everyday cooking oil genuinely fresh.
One last thing: colour tells you almost nothing reliable. Green oil isn't better than gold. Taste is the only honest test — peppery and a little bitter at the back of the throat is exactly right.
On the label, look for a harvest date rather than a best-before date alone.