Meat choice only cut by restaurant at midpoint (2,3)

'restaurant at midpoint' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'meat choice only cut' is the wordplay.
'meat choice' becomes 'au' (I can't explain this - if you can you should give a lot more credence to this answer).
'only' becomes 'just' (synonyms).
'cut' means to remove the last letter.
'just' with its final letter removed is 'jus'.
'au'+'jus'='AU JUS'

'by' acts as a link.

Can you help me to learn more?