I mistakenly quoted R’ Yitzchak Elchanan, it is actually from R’ Chaim Berlin (funny two people to confuse!), ???? ???? ???? ?”? excerpted below:
?”? ????? ????? ????? ?? ??? ?? ???? ?? ??? ????? ?????? ??? ????
??? ???? ???? ??????.
???? ?????? ?? ???? ???? ?????, ?????? ??? ????? ???? ????, ?????? ?? ??’ ??? ????? ??? ?????, ?”? ??? ?????? ?????? ????? ??? ?????? ??????.
???? ?????? ???? ??”? ?? ??? ???? ????? ?? ?? ?????? ?? ???? ?? ????? ????? ?”? ??? ?????? ?????? ??????, ??? ????? ?? ????? ???? ?????? ??? ??? ?? ???? ??????.
??? ?? ???? ???? ??? ?????? ???? ??? ????? ?????, ??? ?? ??? ????? ????? ???? ?????? ???? ?????? ?? ????, ????? ????? ?????? ???? ?’ ???? ????? ?”? ?’ ????”? ???”? ???’ ?”? ???’ ?’ ???? ?”? ?????? ?? ???? ???”? ????, ??? ?? ???? ??”? ?????.
As far as the minhag, I am not sure who the ???? ??? is quoting as being a maikel (and then rejecting) but the ???? ???? is comfortable to state his heter as an absolute pashtus…
As far as Hagalah goes, irui should work. I would be quite surprised if the board was immersed in a vat of hot oil…