a very common sandwich in STL around the turn of the century (1900). Yes, the large german population in STL was probably the instigator of such a delicacy. They were still pretty popular in the 1940s and I am sure you can still get one somewhere today. I do remember driving downtown for Cardinal football games with my Dad and passing a brick building on Chouteau Avenue with "Harvey's Sandwhich Shop. Brains Sandwiches 25 cents" painted on the side. Of course it was no longer in business.