Expression "shop sign drink"

[All Potted Out]

In English, is there an adjective used to refer to the drink or meal that's a must-order and can represent a coffee shop or restaurant?

For example, in Chinese, we call such a drink or meal the "shop sign drink" or the "shop sign meal" because they can represent the restaurant like its shop sign does. But I guess this expression is not used in English...

[Mister Micawber]

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I don't believe we have such signs, APO, although a coffee cup, for instance, may well appear in the signage of a coffee shop.
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Native English teacher at Mister Micawber's