Hi Lisa! Incorporating ice cubes or water to your oven can definitely assist with crust progress (especially when baking sourdoughs!). Although it is not Certainly vital, it will help create a lovely loaf. Here is a tad more info on the procedure: Baking bread with steam Pleased Baking! Rossi Anastopoulo https://finn23g33.bloggip.com/28245471/a-review-of-sourdough