Requires a license given by the Bureaucratic Hall that turns a house into an open structure where people can freely come & go and purchase food items.
Requires Cheffery III, Blending II, Cocktail Crafting II, Saucery II, Grilling II, Master Chef II
Devs should probably dedicate a sort of "commercial space" for that, but turning your house into one would be cool. However, if that was the case, only one house in a given location will be allowed by the Bureaucratic Hall to be converted.
Just an idea though. :D