Kosher food is any food or beverage that Jewish dietary laws allow a person to eat. It isn’t a style of cooking. Keeping kosher is much more complex than that. Rules are the foundation of kosher food. 

Rooted in history and religion, each law is specific about what types of food you can and can't eat. The laws are also strict about the way you process, prepare, and inspect food if you're going to call it kosher.

Keeping kosher is a commitment. It governs what you eat and the way you prepare your meals, as well as the way you use your kitchen and dishes every day

Meat. The Torah says kosher meat can only come from animals that have split hooves and chew their cud/bites (ruminant), like cows, sheep, and goats. When these animals eat, partially digested food (cud) returns from the stomach for them to chew again.

The Torah says fish is kosher if it has both fins and scales

Forbidden animals: the pig, the hare, the rabbit, the camel, all rodents, reptoles, amphibious animals, birds of  prey, nocturnal birds

Forbidden fish:  shellfish, crabs, shrimp, and lobster. Sea creatures that don't have fins and scales aren't kosher.

Kosher Allowed Food Categories:

Meat: cows, sheep, and goats.

 Poultry:  chickens, ducks, geese, turkeys, and pigeons.

Dairy: milk, butter, yogurt, and cheese, must come from a    kosher animal. 

Pareve: eggs, fruits, vegetables, pasta, coffee, and packaged foods.

Fish: salmon, bass, or trout. 

Restrictions:

-              Is not allowed eat meat and dairy together. Is possible eat fish, eggs, fruits, vegetables, and grains with either meat or dairy. 

-              Is not permitted to eat milk and meat products at the same time, put them on the same dishes, or prepare or eat them with the same utensils. Also is necessary  to wait a certain amount of time to eat milk after meat and vice versa.

-              Utensils that touch meat can't touch dairy (and vice versa). 

-              Utensils and cooking surfaces that touch hot, non-kosher food can't touch kosher food. 

-              Is not allowed eat any grape products made by anybody who isn't Jewish.

Must:

Salt must always be present on the table; symbol of abundance, but also of rigor when you sit at the table, you have to take some bread and dye it in salt

Lechem – bread, symbol of divine goodness and mercy

Melach - salt, symbol of rigidity and justice