Grades of olive oils are determined by the methods of extraction and the acid content of the resulting oil. Virgin oils are those obtained from the first pressing of the olive without further refinement. Pure olive oils are those which have been extracted by heat. Pomace olive oil is refined from the final pressings and under heat and pressure. The taste is inferior to other olive oils and should never be substituted for them.
Olive oil becomes rancid very easily, more so when exposed to heat or light.
Always store tightly sealed in a cool, dark place. This is the edible fruit of the olive tree. This curing process is done with brine solutions, salt curing, and drying. A local Hawaiian favorite, especially around the holidays. Orange -blossom extract can be found in fancier food shops.