Related for Chullin 208:9

סוף סוף כלי שני הוא וכלי שני אינו מבשל

But even In that case it is only in a 'second vessel'<span class="x" onmousemove="('comment',' I.e., a vessel into which boiling food or liquid has been poured, in contradistinction from 'a first vessel', i.e., a vessel taken direct from the fire where it has been at the boil. A 'first vessel' can bring other foodstuffs to the boil even when removed from the fire, and in the case of 'flesh and milk' would involve a transgression of the law of the Torah.');">⁷</span>

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