Sesos, Buche, Tripas--Que?

I am always intrigued by the unknown. This time was no exception. I went to a taco shop yesterday that has sesos, buche, and tripas with no explanation. And no one spoke any English. In any event, I ordered all 3 types of taco. The sesos (I believe, I'm still not sure which was which) was a crunchy gluey substance that tasted like crispy fat. The buche had a pungent meaty smell, like beef cologne. The tripas was a little creamy, kind of inbetween the sesos and the buche; aromatic yet fatty. I have to admit I liked all three. But one taco is enough when it comes to such greasy textures.

Would someone please tell me what in the world I ate? I have a feeling it was not filet mignon.