Reference for Avodah Zarah 117:10

ר' יוחנן כי הך לישנא ס"ל דאמר רב שמואל בר רב יצחק אמר רב כל שאינו עולה לשולחן של מלכים ללפת בו את הפת אין בו משום בישולי עובדי כוכבים טעמא דאינן בני תורה הא בני תורה שרי

R. Yohanan follows a different version [of the teaching]: R. Shmuel son of R. Yitzchak said in the name of Rav: Whatever is not brought on the table of kings to dip with bread is not prohibited on account of having been cooked by Gentiles. Therefore his reason was that they were not students of Torah, had they been students of Torah [the lupines] would have been permitted.

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