Certain Sushi require the searing of the fish on the outside. Does this process require a Jew light the torch used to do the searing or is it not required? I have seen that some stores do and some do not. what is the opinion of the Big national Hecsherim or any modern day Poskim you are aware of and why sources would be appreciated?
Per the cRc it does not require Bishul Yisroel
Per the KOR Detroit since tuna can be eaten in its raw form, e.g. sushi, it is exempt from Bishul Yisroel