BensGrandad
New member
The main reason is to help melt the cheese but steaming also softens the bun a little. Just before the end of cooking you top the burger with cheese, bacon, etc (not salad and sauce) and put the top part of the bun on top. You then put the dome over the top and squirt in a small amount of water to create the steam.
Thanks for that as I thought that perhaps you cooked the burger using the dome as a form of lid to cook it and retain the heat to ensure it was cooked in the middle.