The process of pressing cold-pressed olive oil involves extracting the oil from olives without the use of heat or chemicals, which helps preserve the natural flavors, antioxidants and nutrients.
Here’s a detailed breakdown of the cold-pressing process:
- Harvesting the Olives
- Timing: Our olives are typically harvested when they are ripe but not overripe, usually at the end of October, beginning of November.
- Method: Our olives are carefully mechanically harvested. Care is taken to avoid bruising the olives as this can affect the oil quality.
- Washing and Cleaning
- After harvesting the olives are taken to our local press where the olives are washed thoroughly to remove dirt, leaves and any other debris. This is a critical step to ensure no impurities are transferred to the oil during extraction.
- Crushing the Olives
- Nowadays, olives are usually crushed using a crusher that grinds the olives into a paste. The entire olive (including the pit) is crushed and the resulting paste consists of olive pulp and oil droplets.
- Malaxation (Mixing the Paste)
- The olive paste is then slowly mixed or "malaxed" for about 20–40 minutes. This process helps to break down the cell walls of the olive and release the oil droplets.
- Temperature Control: The paste is kept cool throughout the malaxation process, typically below 27°C (80°F), to ensure the oil remains "cold-pressed." This low temperature helps retain the oil’s flavour, aroma and nutritional properties.
- Oil Extraction
- After malaxation, the paste is subjected to centrifugation.
- Centrifugation: The paste is spun in a centrifuge which separates the oil from the water and solids (pomace) based on their different densities.
- The oil extracted from the paste is still in a mixed form, containing both the oil and some water.
- Separation
- The oil is then separated from the olive water (also known as "vegetative water"). This step can be done by further centrifugation. The remaining oil is collected and the solid remnants, known as pomace, are discarded.
- This step ensures the oil is clear and free from impurities.
Benefits of Cold-Pressed Olive Oil:
- Higher Nutrients: The process preserves antioxidants (such as polyphenols), vitamins (especially Vitamin E) which are beneficial for heart health, inflammation reduction, and overall well-being.
- Better Flavour: The oil has a fresh, complex flavour profile with notes of spiciness that is lost in oils made with heat or chemical extraction.
- Unrefined and Pure: Cold-pressed olive oil is unrefined, which means no chemicals or high-heat treatments are involved.
- Acidity Level: The acidity level of cold-pressed extra virgin olive oil is generally low (below 0.8%), which is a sign of high quality.
In essence, cold-pressed olive oil is the result of a traditional and natural extraction process that prioritizes quality, flavor, and nutritional value over speed or cost.
