CREATE TABLE table_31056 ("Episode" FLOAT, "Airdate" TEXT, "Iron Chef" TEXT, "Challenger" TEXT, "Theme Ingredient" TEXT, "Winner" TEXT)

Who was the iron chef when herb Faust was the challenger?
SELECT "Iron Chef" FROM table_31056 WHERE "Challenger" = 'Herb Faust'
SELECT "Iron Chef" FROM "table_31056" WHERE "Challenger" = 'Herb Faust'