The laws of kosher date back to the time of Moses, over 3300 years ago. They are intricate and extensive, detailing which foods a Jewish person is permitted to eat, and the ways in which they may be prepared. One well-known example is the total separation of dairy and meat or poultry ingredients. Although the essential laws have not changed since they were given at Mount Sinai, their application to issues presented by modern processing requires expertise in both kosher law and food technology.