Reference for Avodah Zarah 76:18

וכבשין שדרכן לתת בתוכן יין: אמר חזקיה לא שנו אלא שדרכן אבל בידוע אסור אפילו בהנאה ומ"ש ממורייס דשרו רבנן בהנאה התם לעבורי זוהמא הכא למתוקי טעמא

And pickled foods into which they are accustomed to put wine. Hezekiah said: This teaching only applies when they are merely accustomed [to put wine or vinegar into them]; but when it is certain [that they put wine or vinegar in], it is prohibited to derive any benefit from the foods. Why is this different from murias which the rabbis permit deriving benefit from? There the purpose [of the wine] is to overcome the bad smell [of the fish] and here the purpose is to sweeten the taste.

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