You know the sauce that goes on it!
A variant of "you know the score"; that is, an acknowledgement that one is aware of a meaning or perception beyond that which is immediately discernable.
"...and then with regard to these new upcharges that they claim are for a good cause—well, you know the sauce that goes on it!"
You know the sauce that goes on it! by Matthew Rotch May 26, 2023
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