This is a kind of alchemical processing used in everyday preparation of herbal, mineral and animal medicinals.
There are also more esoteric traditions of processing, including those involving mercury, but the term is used to refer to the more common preparations.
For instance, frying with wine is believed to enhance the circulatory properties of herbs.
Frying with salt is believed to draw the herbal actions to the kidneys.
Otherwise cooling herbs may be warmed up by heated techniques.