To learn how to make olive oil, process fresh, sound olives in a small batch: wash and crush them, gently mix the paste, press it, let the liquid settle, then decant the oil from the water and solids. A home setup can produce usable oil, but the yield is low and separation is the hardest part.
If you are learning how to make olive oil at home, start with 5–10 kilograms of ripe olives and expect roughly 150–500 milliliters of oil from 5 kilograms, depending on the variety, ripeness, and equipment.
From olives to oil: the commercial principle
Olives contain tiny oil droplets inside their cells. Commercial producers follow three main stages:
- Crushing: A mill breaks the olive flesh, skin, and pits into a thick paste and releases the oil.
- Malaxation: Slow, gentle mixing for about 20–40 minutes lets small oil droplets join into larger ones without whipping air into the paste.
- Separation: A commercial centrifuge separates oil from the heavier water and solids. Some traditional mills use a press before settling the liquid.
At home, a food processor or small olive crusher replaces the mill, a bowl replaces the malaxer, and a basket press or strong cloth replaces the industrial separator. The principle remains the same, but home equipment leaves more oil behind in the olive solids and usually produces a cloudier liquid.
How do you make olive oil? Set up a crusher, press, and settling jars
Use olives picked recently, removing leaves, twigs, and damaged or moldy fruit. Rinse them thoroughly and let surface water drain. You will need:
- A food processor, sturdy mortar, or small olive crusher
- A large stainless-steel or food-safe plastic bowl
- A manual basket or fruit press, or several layers of clean cheesecloth
- A fine strainer, funnel, ladle, and clean glass jars
- A dark bottle with a tight cap for storage
Keep the batch small enough for your press. A 5-kilogram batch is more manageable than a full harvest and gives you enough liquid to observe the separation. Avoid reactive metal containers, excessive heat, and equipment that is difficult to clean. Dirty equipment can introduce microorganisms and unpleasant flavors.
How to make olive oil: crush and malax a small batch for 20–40 minutes
- Remove excess moisture from the washed olives. Process them in small batches until you have a coarse, uniform paste. Include the pits if your equipment can handle them safely; do not force a household machine that may overheat.
- Transfer the paste to the bowl. Stir it slowly and continuously for 20–40 minutes. Scrape down the sides so the paste mixes evenly.
- Keep the paste comfortably warm but never cook it. If the bowl or machine becomes hot, pause and let it cool. Excess heat can flatten aromas and accelerate oxidation.
The paste is ready when it looks glossy and you can see small beads or streaks of oil gathering on the surface. If it remains dry and crumbly, continue gentle mixing for another 5–10 minutes. Do not add water simply to make it easier to stir; extra water makes the later separation more difficult.
Press, settle, and separate oil from water and solids
Line the basket press with clean cheesecloth, or place several layers of cloth in a sturdy colander over a collecting container. Add the paste in thin layers, fold the cloth over it, and press slowly. A gradual increase in pressure gives the liquid time to drain. Collect the runny mixture, which contains oil, olive water, and fine solids.
Strain out large particles, then pour the liquid into a tall, narrow glass jar. Leave it undisturbed for 24–48 hours at a cool room temperature. Oil should rise to the top, while water and sediment form a darker, heavier layer underneath. Use a ladle, syringe, or slow pour to remove the upper oil without disturbing the bottom.
For cleaner oil, repeat the settling step in a second jar for another day. Stop decanting when you see a cloudy lower layer, suspended particles, or watery droplets moving into the oil. Those signs mean separation is incomplete. You can filter the oil through clean paper, but filtration will not remove dissolved water.
Store the oil, expect a low yield, and check for sediment
Home pressing commonly recovers only about 3–10% of the olives by weight. From 5 kilograms, that may mean 150–500 milliliters, and poorly ripe fruit or weak pressing can produce less. The remaining olive cake will still contain oil, so a small home press cannot match a commercial mill’s recovery.
Transfer the clearest oil to a clean, dark, airtight bottle. Fill it close to the top to limit oxygen, cap it tightly, and store it in a cool, dark cupboard. If sediment collects, decant the oil again rather than leaving it on the watery layer. Cloudiness, visible droplets, fizzing, or a sour, fermented, or musty smell indicates remaining water, solids, or spoilage; do not keep that batch for long-term storage.