I hate to be the bearer of bad news, but I went over to Fonda today to have lunch and they are no longer Fonda. A temporary sign outside reads "Los Tres Vaqueros." I believe that owners of the two (three, if you count the fact that Los Tres Vaqueros has 2 locations) may be the same.
The website does not show the Fonda location but the menus look very similar. Noticeably absent are the birria, pozole, tacos de tripa, lengua, etc., and some of the less Mexican-American specialties. Fonda's website is down.
I am really going to miss this place.
ETA: I didn't go in for lunch. I went over to Thai House and had a very nice masaman curry instead.