F. Gonzalez-Crussi Chicago, Illinois, USA   “La Trinchera” (The Trench). Mural by the Mexican muralist José Clemente Orozco (1883-1949) in the former San Ildefonso College of Mexico City, now a Museum and cultural center. Author’s collection. I have often wondered what obscure forces impel Mexicans to relish the unbearably acrid hot peppers used as condiment…