Uneven browning of the toast can be caused by uneven topping of the sandwich or uneven distribution of fat on the toast or the appliance. To achieve optimum results, only use the appliance on a flat surface, place the sandwich as evenly as possible and grease the toast or the appliance evenly.
ST 1410, ST 710 - What can I do if one side of the toast is more browned than the other?
