Now that's a winner! Not. Those are known as scare quotes.
Hint: google for scare quotes:
putting the term “global warming” in scare quotes serves to subtly cast doubt on the reality of such a phenomenon
So. Casting doubt upon freshness? In the food service industry, they call that customer repellent!!
How about this one, which I have seen:
NO SHOES, NO SHIRT, NO DOGS, NO SERVICE.
So, no one is allowed in the store without a couple of dogs?
Of course, the “fresh” is intended to indicate emphasis—for which italics or underlining would be appropriate.
How about:
ALL OUR SAUSAGES ARE MADE WITH “PORK”!