What it means
Menu. 菜 means dish or food, 单 means list.
When to use it
Say 请给我菜单 (please give me the menu) to ask for one. Many restaurants now use a QR code instead.
Examples
qǐng请gěi给wǒ我cài菜dān单。
Please give me the menu.
cài菜dān单shàng上yǒu有yīng英wén文ma吗？
Is there English on the menu?
wǒ我kàn看yī一xià下cài菜dān单。
Let me look at the menu.
The full set of survival phrases for greetings, dining, shopping, and getting around, each with audio.