Reference for Zevachim 190:9

ההוא תנורא דאטחו בה טיחייא אסרה רבה בר אהיליי למיכלה לריפתא לעולם ואפי' במילחא דילמא אתי למיכלה בכותחא

- Since there were the remainders of meal-offerings, which were baked in the oven, so that there is boiling and absorbing,<span class="x" onmousemove="('comment',' Baking is technically the same as boiling.');">¹¹</span> we must make it of metal.

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