Kosher means compliant with kashrut (in Italian, kasherùt), the body of Jewish dietary laws. It is not just a menu without pork: it covers permitted meats and slaughter, the separation of meat and dairy, utensils and the kitchen. A kosher menu is therefore either meat or dairy, and cake and desserts must follow the same choice.
For those who observe it, certification with rabbinical supervision is needed, checking the supply chain and preparation. The cost of supervision may be a separate item in the quote. Religious times, such as Shabbat, also matter when setting the date and service times. A kosher menu can be of any cuisine.
What to ask
Ask the caterer whether it works with a certification, who issues it and how it organises kitchen and staff. If the venue has an exclusive caterer, ask whether it allows exceptions for a certified kosher menu. The rules are explained in the guide to kosher catering and the one on special diets.
