If you think that vegetable oils are simply made from compressing plant seeds (rapeseed, soya, sunflower), think again. Olive oil (which is a natural and healthy monounsaturated fat) is produced in this way, the simple extraction technique going back to the days of the ancient Greek civilization. Vegetable oil production is a little more ‘industrial’. You may need a degree in chemistry, or a background in petroleum engineering, to understand its production.
