[Avodah] new chumrah

[Eli Turkel]

<<Weinberg adds, however, that anyone who places food over a flame must at
least observe the Jewish Sabbath. "It's not a question of clothing, it's
Jewish law," Weinberg says.>>

see
http://www.haaretz.com/print-edition/news/kashrut-inspectors-jerusalem-burger-joint-workers-must-don-kippot-1.400439

what is the reason for such a halacha?
As far as I know even a goy can put the food on a pre-existing fire

-- 
Eli Turkel
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