I received an e-mail from C.B., a Fat City reader, today with an unusual request. He wants a bialy, the chewy yeast roll that was once a staple of Jewish-American delicatessens. The Food Lover's Companion describes the roll as "round and flat with a depression in the center...sprinkled with sauteed onion before baking. The name comes from the Polish city of Bialystok." Not to be confused with Max Bialystock -- the role played by Zero Mostel and Nathan Lane in the movie versions of Mel Brook