Some of the main kosher dietary guidelines ban certain food pairings particularly that of meat and dairy.
There are three main kosher food categories:
According to kosher tradition, any food categorized as meat may never be served or eaten at the same meal as a dairy product.
Furthermore, all utensils and equipment used to process and clean meat and dairy must be kept separate even down to the sinks in which they’re washed.
After eating meat, you must wait a designated amount of time before consuming any dairy product. The particular length of time varies among different Jewish customs but is usually between one and six hours.
According to some views, pareve food items are considered neutral and may be eaten alongside either meat or dairy, but the issue is debated.
However, if a pareve food item is prepared or processed using any equipment used to process meat or dairy, it may be reclassified as meat, dairy, or non-kosher.