Olive Oil

Olive oil is a cooking fat pressed from the fruit of olive trees, used in kitchens worldwide for sautéing, searing, dressing, finishing, and baking. What separates olive oil from other cooking oils is its range of grades, from peppery, complex extra virgin to neutral refined, each suited to different cooking tasks and temperatures.

I keep at least two olive oils in my kitchen at all times: a good EVOO for finishing and dressings, and a bottle of regular olive oil for high-heat cooking. After years of buying expensive single-origin bottles for everything, I realized I was wasting money sautéing with oil whose flavor I'd cook right out of it.

Olive oil has been a foundation of Mediterranean cooking for over 4,000 years. Today it remains one of the most studied cooking fats, with well-documented health benefits tied to its monounsaturated fats and polyphenol antioxidants. For a comparison with other cooking fats, see our guide to cooking oil smoke points and butter vs oil.

Olive oil types and grades explained

The grade of an olive oil tells you how it was extracted, how much it was processed, and what it tastes like. Here's what each grade means for cooking:

Extra virgin olive oil (EVOO) is the highest quality. It's extracted mechanically (pressed or centrifuged) without chemicals or excessive heat. To qualify as extra virgin, the oil must have free acidity below 0.8% and pass a sensory panel for defects. The flavor varies widely by olive variety and region: Tuscan oils tend to be peppery and assertive, while Spanish Arbequina oils are milder and buttery.

Virgin olive oil is also mechanically extracted but has slightly higher acidity (up to 2%) and may have minor flavor defects. It's less common in stores than EVOO.

Pure or regular olive oil is a blend of refined olive oil (chemically processed to remove flavor defects) and a small amount of virgin oil for color and taste. The refining process raises the smoke point significantly, making it better for high-heat cooking.

Light olive oil is the most refined grade. "Light" refers to flavor intensity, not calories. All olive oil has the same calorie count (120 per tablespoon). Light olive oil is functionally neutral, like vegetable oil, and handles high temperatures well.

Olive pomace oil is extracted from the leftover pulp (pomace) after mechanical pressing, using solvents and heat. It's the lowest grade and rarely sold for home cooking in most markets, but it's common in commercial kitchens and food manufacturing where high volume and neutral flavor matter more than quality.

When to use each olive oil type

Use EVOO when flavor matters. Drizzle it over finished pasta, into soups before serving, over grilled vegetables, or as a dip for bread. The fruity, peppery notes are the point. Heating destroys them.

Use EVOO for medium-heat cooking too. Despite the myth, EVOO handles sautéing, roasting vegetables at 400°F (200°C), and gentle pan-frying without problems. Its smoke point of 375-405°F sits well above typical sauté temperatures (250-350°F / 120-175°C). I sauté in EVOO all the time and have never hit the smoke point at normal stove settings.

Use regular olive oil for high heat. Searing in a cast iron skillet, deep frying, or any technique above 425°F (220°C). The neutral flavor means you're using it for its cooking properties, not its taste. It also works well for seasoning cast iron if you don't have flaxseed oil on hand.

Use light olive oil for baking. When a recipe calls for vegetable oil or a neutral fat, light olive oil is a direct substitute with a slightly better fat profile.

Olive oil smoke point

The smoke point is the temperature where oil begins to break down, producing visible smoke and off-flavors.

A common concern is that heating EVOO past its smoke point creates harmful compounds. While any oil produces some undesirable byproducts when overheated, research shows that EVOO's high polyphenol content actually makes it more stable than many refined oils at moderate cooking temperatures. The polyphenols act as antioxidants that resist oxidation. This is one of the more surprising findings from food science research in recent years.

How olive oil is made

The production method determines the grade and flavor profile of the final oil.

Olives are harvested in fall and winter, then washed and crushed into a paste (pits included). The paste goes through a malaxation step, where it's slowly mixed for 20-40 minutes to let oil droplets merge. A centrifuge then separates the oil from the water and solids.

For extra virgin and virgin grades, that's the entire process. No heat above 27°C (80°F), no chemicals, no solvents. The oil goes straight from centrifuge to bottle (after settling or filtering).

For refined grades, the oil undergoes additional processing: deodorizing, bleaching, and neutralizing with alkali to remove flavor defects and lower acidity. This produces a neutral oil with a higher smoke point but fewer polyphenols and less character.

How to store olive oil

Olive oil degrades through light, heat, and oxygen. Of these, oxygen does the most damage once you open the bottle.

Look for the harvest date on the bottle, not just the "best by" date. Oil pressed in November that you buy in March is five months old; oil with just an expiration date could be from any harvest. I once bought a bottle of "premium" EVOO that tasted completely flat, and when I checked, it had no harvest date at all. Now I won't buy a bottle without one.

Refrigeration is optional. The oil will solidify and turn cloudy, but this is harmless and reverses at room temperature.

How to read olive oil labels

"First cold press" is a marketing term. All genuine extra virgin olive oil is extracted without heat or chemicals. If it says "first cold press," that's what you'd expect anyway.

"Product of Italy" (or Spain, Greece, etc.) means the oil was bottled in that country, but the olives may have been grown elsewhere. For guaranteed origin, look for DOP/PDO (Protected Designation of Origin) or single-estate labels.

Harvest date is the most useful quality indicator. Olive oil is best within 12-18 months of harvest. A bottle without a harvest date is a yellow flag.

Acidity level: EVOO must be below 0.8% free acidity. Lower acidity (0.2-0.4%) generally indicates higher quality olives and gentler processing.

Awards and certifications: Competition medals (NYIOOC, Mario Solinas) and IOC certification indicate the oil has been independently evaluated.

Olive oil in emulsions

Olive oil is the base of many classic emulsions: vinaigrettes, aioli, and herb sauces like salsa verde. When whisked vigorously with an acid (lemon juice, vinegar) and an emulsifier (mustard, egg yolk), olive oil suspends in tiny droplets that create a creamy, stable dressing. EVOO works best here because its flavor carries the dressing. You can also use it as the fat in a pan sauce when you want a lighter result than butter. It's the go-to fat for confit preparations like garlic confit or tomato confit.

Olive oil in Fond

When a recipe in Fond specifies a type of olive oil, the ingredient list distinguishes between EVOO and regular olive oil so you use the right grade. For recipes that call for a neutral cooking oil, Fond suggests substitutions based on smoke point and flavor profile.

Frequently asked questions

Can you fry with extra virgin olive oil?

Yes. EVOO's smoke point (375-405°F / 190-207°C) is above typical frying temperatures. You'll lose the delicate flavor compounds, so it's not the most economical choice for deep frying, but it's safe and produces good results for pan-frying and shallow frying.

What are the main types of olive oil?

There are four main grades you'll find in stores: extra virgin, virgin, pure (regular), and light. A fifth grade, pomace oil, exists but is rarely sold for home use. The grades reflect how the oil was extracted and processed, which affects flavor, smoke point, and nutritional content.

What's the healthiest olive oil?

Extra virgin, by a wide margin. It retains the most polyphenols, vitamin E, and monounsaturated fats because it's the least processed. The refining process that creates "light" and "pure" olive oil strips out most of the beneficial compounds.

Does olive oil go bad?

Yes, and faster than most people realize. Once opened, olive oil starts oxidizing. Rancid olive oil smells like crayons or old nuts and tastes flat or slightly bitter. If your EVOO has lost its peppery kick, it's past its prime. Use within 6-12 months of opening.

Is olive oil better than butter for cooking?

It depends on the dish. Olive oil has a higher smoke point and better fat profile for heart health. Butter adds richness, browning, and flavor that olive oil can't replicate. Many dishes benefit from both: sear in olive oil, finish with butter.

Which olive oil is best for cooking and frying?

For high-heat frying and searing, use pure or light olive oil. Their higher smoke points (460-470°F / 238-243°C) handle the heat without breaking down. For medium-heat cooking like sautéing vegetables, EVOO works well and adds flavor. Save the expensive stuff for finishing.