There are some underground kitchens/restaurants in London, whereby, their living rooms on certain days are turned into a restaurants with tables and chairs. And its all done via social network. I have eaten in there but I have followed and it looked impressive.
I have noticed that there are similarish outfits here in SG, but mainly bakery and these folks do it from home. Some of the pictures posted of the cakes looks amazing.
I have not bought anything from these vendors but contemplating it, I doubt that they have the required licences, just saying