You can't though. A home isn't a restaurant, and can't be one because it's not in a commercially zoned area, nor is a home kitchen nearly as sanitary as a rest

You can't though. A home isn't a restaurant, and can't be one because it's not in a commercially zoned area, nor is a home kitchen nearly as sanitary as a restaurant kitchen, due to the building materials. Not to mention fire code (commercial kitchens have a proper fire suppression system). It's considered 'underground' because it's strait up illegal given the various other laws concerning business and food preparation. You can't just scrap every law to accommodate something that's become trendy unless you're prepared for neighbourhoods and apartment buildings to all become commercial zones and allow other forms of home businesses...