A Simple Guide to Olive Oil Tasting at Home

Tasting olive oil properly is one of those small pleasures that sounds faintly ridiculous until you actually do it. You do not need a certificate, a tasting room or a vocabulary borrowed from wine critics. You need a few bottles, a clean glass, a slice of apple and half an hour. The point is not to decide which oil is "best" but to notice what each one does, so you can cook with a bit more intention and get more pleasure out of an ordinary shopping budget.

Start with the bottles you already own

Before buying anything new, go through your cupboards. Most kitchens in the UK hold at least one bottle of olive oil bought for a specific recipe and then half-forgotten behind the vinegar. Check the date on the back, and smell it. Flat, waxy, faintly like crayons or cardboard? That is stale oil, and it is worth knowing what that tastes like so you never cook with it again.

Gather three to five bottles at a time. More than that and your palate tires before you have learned anything useful. If you only have two, that is still a tasting.

• Glasses: small tumblers or wine glasses, one per oil. A blue-tinted glass is traditional but a plain one is fine, provided you do not stare at the colour.
• Palate cleansers: slices of tart green apple or plain bread, plus room-temperature water.
• Something to write on: paper and a pen. Number the glasses with sticky labels so you are not guessing later.
• A warm room: oil releases its aromas at around 20–24°C, so do not taste straight from the fridge.

Choosing bottles worth comparing

The real value comes from contrast. Pick oils that differ in a way you can name in advance: a mild supermarket extra virgin against a robust peppery one, or an Italian bottle against a Greek one, or a new-season oil against a three-year-old bottle from the back of the cupboard.

Look for extra virgin on the label. Look for a harvest date rather than only a best-before date. Look for a region, a producer or a single estate. None of this guarantees quality, but it tells you the bottler is thinking about freshness, which is most of the battle.

Price is a rough guide only. A modest supermarket bottle next to an expensive deli bottle makes a genuinely interesting comparison. Sometimes the cheap one wins on everyday cooking; sometimes the pricier one earns its place as a finishing oil. You will not know until you taste them side by side.

The tasting itself, step by step

• Pour about a tablespoon into each glass. If you want a blind tasting, keep the bottles out of sight.
• Cup the glass in your hand for a minute to warm the oil, covering the top to trap the aromas.
• Smell before you sip. Note what comes up: cut grass, tomato leaf, artichoke, almond, apple, herbs, citrus peel.
• Sip a small amount and hold it in your mouth. Draw air through your teeth — a gentle slurp — to spread it across your tongue.
• Notice where it bites: the back of the throat for pepper, the sides of the tongue for bitterness.
• Swallow or spit, then breathe out slowly through your nose. The pepper often arrives a beat later.

What to notice, and what to call it

Aroma. Fresh, green, herbaceous, nutty, fruity — or simply dull. Aroma fades fast, which is why old oil smells of very little. If you can smell tomato plants or green banana, that is a good sign.

Bitterness. Not a fault. It runs from gentle to assertive, and it comes from the same compounds found in rocket, chicory and grapefruit pith. You will feel it on the sides of your tongue. Good bitterness fades cleanly rather than lingering unpleasantly.

Pepperiness. The catch at the back of the throat, sometimes enough to make you cough. It is linked to freshness and to early harvest. A cough is not bad manners; it is information.

Also notice balance and length. Does the oil feel harmonious, or does one element shout over the others? How long does the flavour stay with you after you swallow? Ten seconds is short; a minute is remarkable.

Running it without turning it into homework

Keep the session to six oils at most and taste from mild to robust, so the punchy ones do not flatten everything after them. Take three words of notes per oil — no more. Cleanse your palate with apple or bread between each one. Jot down which oil you would use for what as you go, because those notes are more useful than any score.

If you taste with friends, compare without ranking. It is perfectly reasonable to prefer the cheap bottle, and just as reasonable to prefer the expensive one.

Getting the oils back into the kitchen

Now the useful part. Keep one generous, inexpensive extra virgin for roasting, frying and everyday cooking, and use it freely. Reserve your punchiest bottle for finishing: a peppery oil drizzled over warm white beans, grilled bread or a bowl of chickpeas. A softer, rounder oil suits tomatoes, mozzarella, fish and anything where you want the oil to sit quietly in the background.

Store bottles somewhere cool and dark, away from the oven and the hob, tightly capped, and use them within a few months of opening. Buy smaller bottles more often rather than a huge one that goes stale.

The point of all this is not connoisseurship. It is dinner: bread, beans, good tomatoes, a peppery oil, and the small satisfaction of knowing exactly which bottle to reach for.