Victoria Cast Iron Grill Pan. Square Grill Pan, Seasoned with 100% Kosher Certified Non-GMO Flaxseed Oil ($13.99)
https://ovkosher.org/wp-content/uploads/2019/06/Vaad_Newseleletter_Sivan_EMAIL_060419.pdfThere is always R shlomo milllers psak
Tl;dr version?
I didn't read the whole thing, but I quick glance led me to this...
I would assume that it remains heated after its nifsal. The fat/oil smokes up and blackens during the seasoning process