What is olive oil?

Olive oil is a liquid fat or natural oil obtained by pressing the whole olive. The fruit of this tree, native to the Mediterranean, has a unique flavour depending on its country of origin - some are mild, others peppery or even slightly bitter. Processing techniques result in different 'qualities' of olive oil, whether refined or unrefined. Unrefined oils (extra virgin) are pure and untreated, which means that they are...