Hello Lisa! Introducing ice cubes or water on your oven can really assist with crust growth (especially when baking sourdoughs!). While It is far from Certainly needed, it will help produce a beautiful loaf. Here is a bit more info on the process: Baking bread with steam Delighted Baking! For https://martinmgyqh.daneblogger.com/27830691/the-basic-principles-of-sourdough-bread-san-francisco