A small chain of Mexican restaurants a half step up from taquieras here in the peninsula (area south of SF) named Grullense Taco offers tripe and brain among their meat choices for tacos. I tried both out of a spirit of adventuressness. Tripe tastes a lot like liver, and brain . . . well, uhh, I come down on the side of mushy, bland mess as alluded to above. Didn't order it a second time.

And then there's the mad cow link. Brain and bone (meal) of cow not especially safe to eat. Not sure about pork but I'm OK to eschew, and not chew, pork brains.

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1986 300SDL, 362K
1984 300D, 138K