Canola field, Willamette Valley, Oregon, May 2017. Rapeseed oil is one of the oldest known vegetable oils. There are both edible and industrial forms produced from rapeseed, the seed of several cultivars of the plant family Brassicaceae.
How is edible oil processed?
In the processing of edible oils, the oil is heated under vacuum to near the smoke point or to about 232 °C (450 °F), and water is introduced at the bottom of the oil. The water immediately is converted to steam, which bubbles through the oil, carrying with it any chemicals which are water-soluble.
What is a Ghani oil press?
A ghani is a traditional Indian oil press, driven by a horse or ox.