Appetizers are all frozen and pre-packaged they just deep fried at almost all chains.
Heck I worked at Ethan Allen Inn in Danbury CT a LONG time ago and all the meals were frozen and prepared in France and shipped over. Easily $75 to $125 per person in the 90s.
Smell outside a restraunt is certainly a true statement. No HVAC (A/C or Heater) is going to filter the kitchen's vent. Tell me you can't smell the difference between Burger King's fake grilling and McDonald when your outside of them? Same thing with restaurants. The one's that microwave a ton will