Margaritas 2€. This is enough for me (and my friends) to spend really often a nice evening together at El Sombrero. The food may not be really 100% mexican, but it's good enough and at fair prices. My suggestions are some XXXL burgers, and the spare ribs (also all you can eat on mondays). Really nice personnel (except sometimes the guy i assume to be the boss).
If you plan to have dinner it's almost mandatory to have a reservation.