Morcilla is where most U.S.ers draw the line in the context of “sketchy” meat parts, seso is where many Argentines do. I’m talking about the young, cool Argentine, the overpriced Vie Bohème rag wearing portenos, long-haired collectors of neon platform Birkenstocks and identical Prune bags. Mention eating brain for dinner to these painfully hip youngsters and they’ll…