Do you leave the film on frozen lasagna?
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                            Cooking Stouffer's Lasagna Leave the film covering on the tray, and don't vent it. Put the tray on a baking sheet, and put the sheet on the center rack in the oven.. 
                    
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                                   Leave film on tray, do not vent. Place tray on a baking sheet, center rack. Remove baking sheet from oven.. 
                                
                            
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