You may want to know about menu and you may ask that What is Menu? / Definition of Menu:
Menu is a list of (F&B) Food and Beverage items with unit or package price and some menu are furnished with introduction of Food like with what made the food. Which an establishment can offer, arrange is logical sequence.
When guest take seat in a table of a restaurant then menu submission is the first job of a waiter/waitress after welcome to Guest so that they can be aware about your food and its price.
Basically Menu is the main way to give or take order from guest. Guest may order properly to see the menu and he/she be aware about your food and price. And I think Menu is the first step to start your service because it is the part of F&B Service.