Chili Olive Oil: How Chilli Infused Oil Is Actually Made
Chili olive oil is one of those searches where the spelling tells you something about what the searcher is expecting. Americans write chili, the British write chilli, and the two spellings tend to lead to two genuinely different products — a Mediterranean olive oil steeped gently with dried chillies on one side, and a Chinese-style chilli oil made by pouring very hot neutral oil over flakes and aromatics on the other. They are not interchangeable, they are not made the same way, and a recipe written for one will disappoint you if you follow it for the other. This article is about the olive oil version: how the heat actually gets into the oil, and how to make or buy a good one.
For our own oil, see our cold-pressed organic Marrakech olive oil.
The Short Answer
- Chilli infused olive oil is an infusion, not a sauce. Dried chilli is steeped in extra virgin olive oil so that the heat compounds move into the fat; nothing is left suspended in it.
- Chinese chilli oil is a different thing entirely. It is made by pouring very hot neutral oil over chilli flakes and aromatics, and the solids stay in the jar. Olive oil is rarely used, because its own flavour fights the aromatics.
- Capsaicin is fat-soluble. That is the whole mechanism — heat dissolves readily into oil and barely at all into water, which is why oil is the traditional carrier and why milk beats water when you have overdone it.
- Hot infusion is fast and blunt; cold infusion is slow and more aromatic. Gentle warmth extracts in under an hour; a cold steep takes one to two weeks and keeps more of the oil's own character.
- Dried chilli, not fresh. Fresh produce sealed under oil is the genuine safety case, and it is covered properly in our guide to garlic infused olive oil — read that before you infuse anything fresh.
- A good bottle names the oil first. If the label leads with the chilli and says nothing about the grade or origin of the olive oil beneath it, the oil is usually the cheapest part of the recipe.
Chilli Oil and Chilli Infused Olive Oil Are Not the Same Product
This is the confusion worth clearing first, because it explains most of the disappointing results people get at home.
Chinese chilli oil — including chilli crisp — is made by heating a neutral oil until it is genuinely hot and pouring it over coarse chilli flakes, often with garlic, ginger, star anise, Sichuan pepper and salt. The heat toasts the flakes as it hits them, and the solids remain in the finished jar. It is a condiment you spoon, not an oil you pour.
Chilli infused olive oil is a steeping. Dried chilli sits in extra virgin olive oil, warm or cold, until the oil has taken on heat and colour, and is then strained. What you keep is a clear, red-tinged oil for drizzling.
Neither is better. But an olive oil infused at chilli-crisp temperatures will taste harsh and scorched, and a chilli crisp made with a peppery extra virgin will taste of two arguments at once.
How the Heat Gets Into the Oil
Capsaicin and its relatives — the capsaicinoids — are the compounds responsible for the burn, and they are strongly fat-soluble and poorly soluble in water. Put dried chilli in oil and the capsaicinoids migrate out of the plant material and into the fat; put it in water and comparatively little happens.
Two practical consequences follow. First, an infused oil carries heat efficiently, which is why a few drops go a long way. Second, the extraction is driven by time and temperature together — you can trade one for the other, which is exactly the difference between the two methods below.
The colour follows a different set of compounds. The red comes largely from carotenoid pigments, which is why an oil can look fierce and taste mild, or the reverse.
Hot Infusion Against Cold Infusion
Both methods work. They produce noticeably different oils, and the choice is really about what you want to keep.
| Warm infusion | Cold infusion | |
|---|---|---|
| Method | Oil warmed gently with dried chilli, never shimmering or smoking | Dried chilli left in oil at room temperature, out of the light |
| Time | Under an hour, plus cooling | One to two weeks |
| Heat extracted | More, and faster | Less, and more gradually |
| Effect on the olive oil | Some of the fresh, grassy character is lost | The oil's own flavour survives largely intact |
| Best for | A robust cooking or finishing oil | A good extra virgin you do not want to damage |
| Main risk | Overheating, which scorches the chilli and dulls the oil | Impatience, and light exposure during the steep |
The single most common mistake is treating warm infusion as frying. If the oil is hot enough to sizzle the chilli, it is hot enough to strip the flavour compounds you paid for in the first place — which is a different question from cooking with olive oil, covered in our guide to olive oil for frying.
Which Chilli, and How Coarsely
The chilli decides the character far more than the method does. Dried chillies are not simply hotter or milder versions of one another; they carry quite different flavours alongside the heat.
| Dried chilli | Heat | Flavour it brings | Suits |
|---|---|---|---|
| Peperoncino / Calabrian | Mild to medium | Fruity, slightly sweet, the classic Italian profile | Pasta, pizza, beans, a general spicy olive oil |
| Árbol | Medium to hot | Clean, sharp, not much else in the way | When you want heat without a flavour argument |
| Ancho or guajillo | Mild | Raisin, cocoa, dried fruit depth | Roasted vegetables, pulses, stews |
| Chipotle | Medium | Smoke, which will dominate everything | Use sparingly, and never with a delicate oil |
| Bird's eye | Hot | Direct, front-loaded burn | Small quantities, short steeps |
Break the chillies rather than powdering them. Whole pods extract slowly and evenly and strain out cleanly; a fine powder clouds the oil, sinks into a sludge and keeps extracting long after you wanted it to stop.
Making It at Home, Safely
Two rules cover most of it. Use dried chilli rather than fresh, and keep the finished oil cool, dark and sealed.
The reason for the first rule is the one that applies to every infusion involving fresh produce under oil, and we are not going to restate it in half form here — our article on garlic infused olive oil sets out the botulism guidance properly, including the tested acidification method and the storage rules, and everything in it applies to fresh chillies exactly as it does to fresh garlic. Read it before you put anything fresh in a bottle.
Beyond that: strain the solids out once the oil tastes the way you want, use clean dry glass, and treat a home infusion as a short-life product rather than a store-cupboard staple. Our article on expired olive oil covers what going off actually looks like.
How to Judge a Bought Bottle
Shop-bought chilli oils vary more than almost any other infused category, because the chilli hides a great deal. Four checks do most of the work.
- What the oil is. The label should say extra virgin olive oil, not "olive oil" or "vegetable oil with olive oil". A bottle labelled chili infused olive oil that never names the grade is telling you where the money went.
- How the flavour got there. Real infusion lists chilli or chilli extract. "Flavouring" is a different production route and usually a cheaper one.
- Whether the oil is named at all. Origin, cultivar and harvest year on a chilli oil are rare and a strong signal when present.
- The glass. Dark glass matters more here than usual, because the pigments that give the oil its colour fade in light and take the appearance of freshness with them.
| What the label says | What it usually means | Signal |
|---|---|---|
| "Extra virgin olive oil, dried chilli" | A genuine infusion on a named grade | Strong |
| Origin, cultivar or harvest year given | The producer knows and will tell you what the base oil is | Strong |
| "Olive oil" with no grade | A refined blend beneath the flavouring | Weak |
| "Chilli flavouring" or "natural flavouring" | Flavour added rather than extracted from the chilli itself | Weak |
| Clear glass, large format | Pigments and aromatics will fade before the bottle is finished | Weak |
Our guide to infused olive oil covers the category as a whole, and our guide to choosing a quality olive oil covers the base oil beneath any infusion.
The Objections Worth Taking Seriously
"Why waste a good extra virgin on an infusion?" A fair challenge. If you are going to warm-infuse aggressively, you will lose much of what makes a fine oil fine, and a mid-range extra virgin is the sensible choice. Cold infusion is the opposite case — the oil's character survives, and a bland base oil produces a bland chilli infused oil no matter how good the chillies were.
"Infused oils are just a way of hiding poor oil." Sometimes, yes, and that is exactly why the first check on any bottle is what the base oil is. It is not an argument against the category; it is an argument for reading the ingredients line.
"Isn't home infusing risky?" With dried chilli, sensible storage and a short life, it is a normal kitchen activity. With fresh produce under oil it is a real hazard rather than a theoretical one, which is why we point to the garlic article rather than summarising the guidance loosely.
Why Sidr & Stone
We do not sell a chilli oil. What we sell is the thing underneath one — the base oil that decides whether an infusion is worth making at all — and the reason we write these articles is that the base oil is the part the category is quietest about.
- Single-estate — one family-owned grove on the plains outside Marrakech, Morocco, with no blending across origins.
- Rain-fed — no irrigation; the trees take what the season gives them.
- Organically grown — no synthetic fertilisers, pesticides, or herbicides.
- Single harvest — a small, limited batch, picked when the season says the fruit is ready rather than when the calendar does.
- Cold-pressed within hours of harvest — flavour, aroma and polyphenols preserved.
- Unfiltered extra virgin — minimally processed, and it may show a little natural sediment, which is normal in an honest unfiltered oil.
- 100% natural — a single ingredient, with nothing added.
- 500 ml dark glass with a gold label — protective packaging in a size built to be finished while it is still fresh.
- Halal certified, with 10% of profits to charity — a commitment that applies to every Sidr & Stone product.
- Fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone makes the best chilli oil — we do not make one, and there are excellent small producers who do. What we will say is that a cold steep of good dried chilli in a single-estate, rain-fed, cold-pressed oil gives you something no bottle of flavoured blend will, because you can taste both halves of it.
Frequently Asked Questions
What is chili olive oil?
Extra virgin olive oil that has been steeped with dried chilli until the capsaicinoids and pigments have moved into the fat, then strained. It is a finishing oil rather than a condiment, and it is distinct from Chinese chilli oil, which keeps its solids and is usually made with a neutral oil.
How do you make chilli infused olive oil at home?
Break dried chillies into a clean dry jar, cover with extra virgin olive oil, and either steep cold for one to two weeks out of the light, or warm the oil gently — never to the point of shimmering — for under an hour. Strain the solids out and keep the finished oil cool and sealed.
Is it safe to put fresh chillies in olive oil?
Fresh produce sealed under oil is the genuine safety case in this category, and the guidance is set out in full in our article on garlic infused olive oil. Dried chilli avoids the issue. If you want to work with fresh, read that guidance first rather than relying on a summary.
Which olive oil should I use for a chilli infusion?
Extra virgin, and a better one for a cold steep than a warm one. A cold infusion keeps the base oil's own character, so a flat oil produces a flat result; a warm infusion is more forgiving of a mid-range bottle.
How long does a chilli infused oil keep?
Treat a home-made one as short-life. Store it cool, dark and sealed, strain the solids out rather than leaving them in, and use it within a few weeks rather than months — the oil beneath the chilli ages exactly as any olive oil does.
Why is my spicy olive oil not hot enough?
Usually too little chilli, too little time, or chillies that were mild to begin with. Heat extraction depends on time and temperature together, so a short cold steep of a gentle pepper will taste of very little. Break the pods rather than using them whole to speed it up.
Can I use chilli olive oil for cooking?
You can, but most of what you paid for is volatile and heat-sensitive, so it is better added at the end. Use a plain oil in the pan and the infused one over the finished plate.
Is olive oil a medicine?
No. Olive oil is a food, not a medicine. It has a long traditional history — including being honoured in the Prophetic Sunnah — and a substantial body of modern research, particularly around polyphenols, cardiovascular health, and the Mediterranean diet pattern. It can be a worthwhile part of a healthy routine, but it does not cure diseases and is not a substitute for medical care. Be cautious of any olive oil marketed with specific disease-cure claims.
Final Thoughts
Most of the frustration around this subject comes from two products sharing a name. Once you separate the Sichuan-style condiment from the Mediterranean infusion, the decisions get simple: dried chilli rather than fresh, warmth rather than heat, patience rather than speed, and a base oil good enough to still taste of itself when the chilli has had its say.
A chilli infused oil is also one of the few infusions where you can honestly taste the quality of the underlying oil through the flavouring — the heat sits on top of the oil rather than replacing it. Which makes it a surprisingly good test of what you started with.
Start with an oil you would happily eat plain. The chilli will not rescue one you would not.
Our cold-pressed organic Marrakech olive oil — single-estate, rain-fed, organically grown, and cold-pressed within hours of harvest — is available to pre-order, with fulfilment in the UK, EU, and US. First harvest, estimated shipping from November 2026.
Pre-Order Sidr & Stone Organic Marrakech Olive Oil — Limited First Harvest →
Disclaimer: This article describes infusion methods, ingredients and label practices at the time of writing; product specifications and food safety guidance may change, and readers should check current sources. Food safety guidance for infusions involving fresh produce is set out in our article on garlic infused olive oil and should be read in full before infusing anything fresh. Olive oil is a food, not a medicine, and is not a substitute for medical treatment of any condition. For any health concern, consult a qualified medical professional.