Egg McMuffin and Tuna???

Question

HaRav, In a recent QA this message and answer were given:

Answer

Answered by Aaron Abadi

Sorry! Cooked eggs is no good, if cooked by a non-Jew. AA What is the difference between the Egg McMuffin, which is cooked by an non-Jew, and the tuna used in the Subway sandwich which was cooked by a non Jew. Granted, the sandwich isn't cooked, but the tuna had to be cooked in order to be canned - isn't this a problem of Bishul Akum, and wouldn't it be a problem for all canned foods since cooking is part of the canning preservation process? Moreover, the Egg in an Egg McMuffin is fried on a griddle, not cooked in liquid in a pot (I know this because I used to eat there often before becoming a Chozer B'Tshuva). This would make it tigun not bishul. Does Bishul Akum apply to tigun as well? Looking forward to your response and Thanks in advance, Aric