Introduction.

As it says in german, man ist was man isst! "Man is what man etas, the word kosher is familiar and, at the same time, goreign, one may think of strict rules and religious regulations. 

In Hebrew, “Kashrus,” from the root kosher (or “kasher”), means suitable and/or “pure”, thus ensuring fitness for consumption.
The laws of “Kashrus” include a comprehensive legislation concerning permitted and forbidden foods. There are several aspects to these dietary rules. We will consider each aspect in turn.

Fruits, vegetables, cereals

All products that grow in the soil or on plants, bushes, or trees are kosher. However, all insects and animals that have many legs or very short legs are not kosher. Consequently, vegetables, fruits and other products infested with such insects must be checked and the insects removed.
A vegetable prone to insect infestation (e.g. cauliflower) must be carefully examined.

Fruits and Green plants

Certain laws apply specifically to the planting and sowing of vegetables, fruits, and grains. Hybridization of different species: One may not sow two kinds of seeds on a field or in a vineyard. (Lev.19:19/ Dtn.22:19)
Forbidden fruit: Fruits from trees planted within the past three years may not be eaten. (Lev.19:23) New grain: Biblically, no new grain may be eaten, or bread baked from it, before one brings an “omer” of the first fruits of the harvest on the second day of Passover (Lev.23:14)

Conclusion

The process of kosher certification has been radically affected by deep changes in the food industry and by the fact that more than 80% of the products offered by the industry contains pre-processed ingredients. Industrialization presents marvelous opportunities, but the inexorable pace of change in industrial procedures and the complexity of foodstuffs and ingredients also present significant challenges for the kosher certification process.
KIR has risen to these challenges in the course of more than fifty years’ experience with food technology.