[Tagging] Tag for a milk_shake shop?

[ael]

How do I tag a shop that sells milk shakes?

This one: https://shakeshop.co.uk/menu/

I have used
amenity=milk_shakes
and 
shop=dairy
for now.

But shop=dairy seems misleading. Just shop=milk_shake, perhaps?

Or perhaps
shop=dairy  and
dairy=milk_shake ?

That last seems the best choice?


This is a reason why I am concerned that shop=yes is not being rendered
in some cases. shop=yes seems a reasonable tag when there are no obvious 
tags.

ael