In Arlington Texas a few days looking for great Menudo.
To be honest, I've always thought FTW had better Mexican places than Arlington for the most part, but when I lived in Ag-Town, Danielitas was pretty good. We used to go there for breakfast quite a bit. I havent had their menudo, but I've had the caldo de res a lot and it was good. Another place to try is Supermercado Monterrey on Pioneer. Again, havent had the menudo (gotta be truthful, the only menudo I will eat is what mi familia makes), but the other food I've had there is good and I know they have it.
If you are willing to venture over to FTW, try Esparanza's. It is probably my favorite Mexican place for breakfast.