Why Bake Sourdough in a Dutch Oven?

A Dutch oven works well for sourdough because it traps moisture around the loaf during the first part of the bake.

That gives a home baker something an ordinary oven can struggle to provide: a small, steamy baking environment right around the bread.

It Traps Steam Around the Loaf

Sourdough contains plenty of water. As the dough heats up in a covered Dutch oven, some of that moisture turns to steam.

Instead of quickly escaping into the oven, the lid holds much of that moisture around the loaf.

You usually do not need to add extra water. The dough provides the moisture and the Dutch oven helps keep it where it is useful.

Steam Gives the Loaf More Time to Expand

The surface of bread begins drying as soon as it enters a hot oven.

If the crust becomes firm too quickly, the expanding loaf has less freedom to grow.

The humid environment inside a covered Dutch oven keeps the surface flexible for longer. That gives the gases already inside the dough more time to expand during the early part of the bake.

This is one reason Dutch ovens can help produce good oven spring.

Removing the Lid Helps the Crust Brown

The lid is useful at the beginning, but it does not normally stay on for the whole bake.

Once the loaf has expanded and the crust has started to set, the lid is removed. Moisture can then escape and the surface begins to dry, brown and become crisp.

So the two stages have different jobs:

• Lid on: retain moisture and allow the loaf to expand
• Lid off: dry and brown the crust

Cast Iron Also Holds Heat Well

A cast iron Dutch oven has plenty of thermal mass, so once it is hot it holds heat well throughout the bake.

Many sourdough recipes call for the Dutch oven to be preheated with the oven, although you should follow the method used by your particular recipe and cookware.

Do You Need a Dutch Oven for Sourdough?

No.

A Dutch oven is simply a convenient way to create the warm, humid environment that sourdough benefits from early in the bake.

A bread oven or bread cloche can work on the same basic principle.

If you already own a suitable Dutch oven, though, it is one of the simplest ways to bake sourdough at home: cover the loaf to hold in moisture, then uncover it later so the crust can finish browning.