Nutrition values are an estimate, per slice with icing. Use plain pumpkin puree, not pumpkin pie filling. Grease every groove of the tin just before filling it. The cake must be completely cool before icing. Allow extra time for cooling and about 20 minutes for the icing to set. Optional garnish: chopped toasted pecans and a light dusting of cinnamon. Store iced cake covered in the fridge.