If Mexican for Mexican's sake doesn't suffice, this sandwich joint also serves Hawaiian, Swiss, and German styles, and name-checks Poland and Cuba, too. Since none of these outliers has a discernible presence in Oakland's Fruitvale neighborhood, this seems to be an expansionist play for jaded palates, as at many pizzerias. One or all of these tortas might be tasty; I can't speak from personal experience.
La Torta Loca
3149 International Blvd. (34th-35th Aves.), Oakland
510-532-7105
(From an August 2011 visit)