If you want authentic Mexican food - Hardcore, no frills, great taste, for cheap(!), go to this great hole-in-the-wall Taco Stand :). La Estrella Tacos is literally a house converted into a Taco Stand.
Very simple, ""fast food""-like, you order, you get the food, and you can slam it down on the spot (standing), or take it back home.
Highlights include: SESOS (cow brain), Buche (stomach), Al Pastor (my favorite - ultra-marinated stewed pork slices - THE BEST Al Pastor I've had in L.A., hands down). Grab a Horchata or Jamaica to wash it all down :).
BTW, there ain't no ""mystery meat"" here (don't listen to the other reviewer), who obviously doesn't know Spanish - those are some of the best meats to have in the tacos :).
Pros: Great Selection Meats, Authentic Mexican, CHEAP
Cons: No seating