The kashrut is a series of laws regulating the Jewish religion preparation and consumption of food. The term kosher or casher thus defines the set of safe food, which exclude animals considered "impure" such as pork and shellfish, most of the insects, including some lobsters, mixtures of meat and milk...
Accepted animals must also be killed following a few defined guidelines, and agricultural products should also comply with particular precepts. The reasons for this can be sought both in Jewish philosophy, which according to some theologians gives kosher animals representing virtues, while non-kosher symbolize vices, such as health and health reasons, although this is quite debatable.
Mammals that can be consumed, in general, have two fundamental characteristics: they must have a cloven hoof and be ruminants, while birds have traditionally been kosher, and fish must have fins and scales. All invertebrates are prohibited, excepting certain types of grasshoppers, as already mentioned, as well as reptiles and amphibians.
In addition, among other foods, also the meat of an animal that is considered kosher is prohibited if it has not been slaughtered according to the laws of shechinah; for example animals showing lesions or significant defects; their blood; certain parts of the abdominal fat of cattle; or fruit produced by a tree in the first three years after planting, which also affects the grapes and the wine that they produce at later stage.
Certain mixtures such as meat and milk are not permitted, plants that have grown together, such as any grain or vegetable planting are also prohibited with a vineyard, milk that has been mixed with non-kosher animals and their derivatives.
As for the wine, it must be produced exclusively by Jews and grapes can not be stepped on, because the feet are considered impure. Thus, all wines, to be considered kosher, require special certification by a rabbi, something that producers in many parts of the world are increasingly aware of.
Nexus Kosher 2013
Domaine de la Commanderie (Kosher) 2014