About Jewish culture reflects the heart of a vital ethnic history. As that culture continues to shift and adapt alongside mainstream America, delicatessen food - as its name suggests - remains a beloved communal delicacy.In Houston, Texas, third-generation deli man Ziggy Gruber has built arguably the finest delicatessen restaurant in the U.S. His story - augmented by the stories of iconic delis such as Katz's, 2nd Avenue Deli, Nate 'n Al, Carnegie, and the Stage - embodies a tradition indelibly linked to its savory, nostalgic foods. (C) Cohen