The salespeople at Kitchen Window were so excited last winter when this cooking school opened one floor up from the retail store that they would occasionally give customers impromptu tours of the facility. The airy, state-of-the-art 1,200-square-foot classroom is stunning indeed, decorated in blond woods and neoindustrial stainless steel, with a 32-foot island that seats 20 people, and a sound system and video monitors for clear viewing of the work areas. Classes range from demonstration-only to participation to multiweek workshops taught by renowned chefs and cookbook authors. Subjects include fundamentals (preparing pastas or cooking fish), international flavors (French, Mediterranean, Indian, sushi), bread baking, cake decorating, and pressure cooking. A few classes cost $20; most range from $40 to $60, with multiweek series running $200-plus. Go ahead, call 'em and let them coax out your inner Julia Child.