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Powdered sugar falls as Chef Johnny Poche' puts the finishing touches on a piece of Tiramisu at Maggiano's Friday  Jan. 28,2005.(Dave Rossman/For the Chronicle)     HOUCHRON CAPTION (02/03/2005) THIS WEEK Z12:  SWEET ENDING:  Powdered sugar puts the finishing touch on tiramisu, which is the dessert item in Maggiano's cooking class for Valentine's Day. The class is from 6:30-7:30 p.m. Wednesday in a private banquet room.