Muslims can eat from the food of people from earlier revelation unless their belief has been distorted to total atheism. If so, they are considered unbelievers and any meat they have prepared is unlawful to eat.
Some scholars see that Muslims living in non-Muslim countries should refrain from eating doubtful meat or food. Others permit it unless they are sure it was slaughtered unlawfully or involve what is forbidden.
Muslims who are resident in non-Muslim countries are not allowed to eat meat from animals slaughtered by unbelievers. It is also prohibited to eat any food that is mixed with such meat including the sauce.
Some scholars permit that Muslims eat permissible animals slaughtered by people of earlier revelations if they live in non-Muslim countries. But electrically shocked animals are prohibited unanimously.
