Question: What is the ruling on dealing with restaurants, which most of its workers or all of them are from the Druze or Shi’ah or non-Muslims?
Answer: If they slaughter, then do not eat their meat if they are non-Muslims. This is because it is not allowed to eat their slaughtered meat. If he deals with them in something that has no slaughtering involved, like fruits or food, then there is no harm. However, it is necessary to abandon them and to deal with other than them as much as possible
[Taken from Fatawaa Munawa’ah no. 18 found here: http://audio.islamweb.net/AUDIO/index.php?page=FullContent&audioid=191861#220183]
Faisal ibn Abdul Qaadir ibn Hassan