Seymours of Norfolk Ltd and their infused Olive Oil
Lemon, chilli, garlic, rosemary, truffle — flavoured and infused olive oils crowd every deli shelf and ‘on tap’ dispenser. Some are made with genuine craft. Others use a bold flavour to disguise a mediocre or tired base oil. Knowing the difference is simple once you understand how they are made.
A flavoured olive oil is only ever as good as two things: the oil it starts from, and the way the flavour got in. Get both right and you have a small luxury — a lemon oil that lifts a plate of fish, a chilli oil with real heat and real fruit underneath. Get either wrong and you have a gimmick: a harsh flavouring poured over a cheap, flat oil to sell it at a premium. The loud taste is doing double duty as a disguise.
Two ways the flavour gets in
There are broadly two methods, and they are not equal. The cheaper, commoner one is infusion: steeping herbs, chilli or citrus zest in finished oil, or — at the bottom end — stirring in a flavour essence. It works, but it is easy to fake and easy to do to a poor base. The finer method is agrumato (or co-milling): crushing whole lemons, oranges or herbs together with the olives at the mill, so the flavour is pressed into the oil at birth. Agrumato oils are fresher, rounder and more expensive, and they taste unmistakably of the real fruit rather than of an added drop.
The base oil is the tell
Here is the insider point the label rarely volunteers: ask what the oil was before the flavour arrived. A good producer starts with a decent extra virgin and adds flavour to enhance it. A cynical one starts with the cheapest oil they can find, because they know the chilli or truffle will hide its faults. Truffle oil is the notorious case — most so-called truffle oil contains no truffle at all, just a lab-made aroma compound over a bland base. If a flavoured oil is suspiciously cheap, the flavour is almost certainly covering for the oil.
One that is worth a word of caution
Garlic oil deserves a genuine safety note, separate from any taste question. Raw garlic left submerged in oil at room temperature is a classic low-acid, oxygen-free environment — exactly the conditions that can let Clostridium botulinum grow. Commercially made garlic oils are acidified or otherwise controlled to prevent this. A homemade jar of raw garlic in oil left on the counter is a real, if rare, hazard: keep such infusions refrigerated and use them quickly, or buy a properly made commercial version. This is general information, not medical advice.
| Infused / steeped | Agrumato (co-milled) | |
|---|---|---|
| How made | Flavour steeped into finished oil | Fruit/herbs crushed with the olives |
| Freshness | Variable | Bright, fresh |
| Cost | Lower | Higher |
| Risk of masking | High if base is poor | Low — quality shows |
| Tastes of | An added flavour | The real fruit |
Buying and using flavoured oils
- Ask about the base oil; a good flavoured oil starts from a good extra virgin.
- Prefer agrumato citrus oils — co-milled fruit tastes real, not perfumed.
- Be sceptical of cheap truffle oil; most contains no truffle, just an aroma compound.
- Treat homemade garlic-in-oil with care — refrigerate, use quickly, or buy commercial.
- Use them raw as finishers; heat drives off the delicate aromatics you paid for.
Infused olive oils: common questions
What’s the difference between infused and agrumato oil?
Infused oil has flavour steeped into finished oil; agrumato oil is made by crushing the fruit or herbs together with the olives at the mill, giving a fresher, more genuine taste.
Is flavoured olive oil lower quality?
Not necessarily, but a strong flavour can hide a poor or tired base oil. The quality depends entirely on the oil underneath and how the flavour was added.
Does truffle oil contain real truffle?
Usually not. Most commercial truffle oil is a bland base oil plus a synthetic aroma compound rather than actual truffle.
Is homemade garlic oil dangerous?
It can be. Raw garlic in oil at room temperature can foster botulism-causing bacteria, so keep such oils refrigerated and use them quickly, or buy a properly acidified commercial one. This is general information, not medical advice.
How should I use flavoured oils?
Raw, as finishing oils drizzled at the end, so the delicate added aromas survive. Heating drives them off.
My rule with any flavoured oil is to ask one question the label dodges: what was the oil before the flavour got in? An honest maker starts with a good extra virgin and lifts it; a cynical one starts with the cheapest oil going, because the chilli or the truffle essence will hide the sins. That is why the very cheap flavoured oils are usually the worst value — you are paying a premium for a disguise. And do take the garlic-in-oil warning seriously; it is the one flavoured oil where the risk is safety, not just taste.
Drawn from flavoured and agrumato oil production and food-safety guidance on garlic in oil.