Imagine a restaurant that’s not really a restaurant but, rather, an event that will exist for only a limited period of time. What you’ve just imagined is a pop-up restaurant, a phenomenon that’s sweeping the food world and that’s been spearheaded, mostly, by L.A.’s Ludo and Krissy Lefebvre. I met them both back in July when they came over to my New York apartment (what!) and I fed them a piece of Melissa Clark’s pecan chocolate chip loaf cake. We talked about the fact that I was moving to L.A. and how, once I got here, I’d have to eat at LudoBites. They offered no help, though, in securing a reservation. I’d be on my own. I was ok with that.