Need help here from all the eagle eyed hounds in the 'burg. Last night around 8 pm returning from another stellar mini-chowdown at Thai Royal Orchid, driving west on Herndon approaching Blackstone we came up on a big white taco truck with large blue lettering on the back and side with just the word "Pupusas" on it, nicely painted in blue letters with a darker outline. As we passed it I caught the name La Sabrosita on the front panel of the driver's side.
I'm still kicking myself for not listening to LadyPB's advice to follow him. I've googled the name with no luck. My guess is the driver may have been heading home to somewhere in the Pinedale area (NW of the intersection).