The ZOFO Duet of pianists Keisuke Nakagoshi and Eva-Maria Zimmerman has been a frequent visitor to the Noontime Concerts™ (“San Francisco’s Musical Lunch Break”) series of recitals given on Tuesdays at Old St. Mary’s Cathedral. They returned today to give a performance of the oldest and newest compositions in their current working repertoire. The program began with Franz Schubert’s D. 940 fantasie in F minor, followed by Gabriela Lena Frank’s first in a projected series of compositions entitled “Sonata Serrana,” one of five pieces to receive its world premiere in an Old First Concerts recital at the end of January…