As salaamualikum
. I want to get into the catering business but my worry is that the dishes and cutlery will be used by non muslims and muslims – is it ok or not for muslims to be eating from the same plate and would my profit be halal?
By washing the utensils in the prescribed Shaari manner then there is no problem for a Muslim to eat from a plate previously used by a non-Muslim. However, do not cook Haraam food.