How to Stop the Bottom of Sourdough Getting Too Dark

You take the lid off your Dutch oven and the loaf looks great — good rise, nicely browned crust — but when you turn it over, the bottom is much darker than you wanted.

This is a common problem when baking bread in a heavy cast iron Dutch oven. Cast iron holds a lot of heat, and some ovens deliver more heat from below than others. The base of the pot can keep browning the bread while the top of the loaf is still finishing.

If the rest of your bread is baking well, you probably do not need a different Dutch oven. Start with a few simple changes.

Put a Baking Tray on the Rack Below

This is the first thing we would try.

Place an empty baking tray on the oven rack below your Dutch oven. Leave the Dutch oven on its usual rack rather than sitting it directly on the tray.

The extra tray acts as a heat shield and reduces some of the strong heat reaching the base of the Dutch oven.

It is a simple change and does not require you to alter your dough, baking temperature or timing.

Check Where Your Dutch Oven Sits

If you normally bake close to the bottom of the oven, try moving the Dutch oven closer to the centre.

Ovens do not all heat in the same way. In some, the lower part of the oven runs particularly hot, which can cause the base of a cast iron pot to brown bread faster than expected.

Moving the pot up one rack position may be enough to make the bottom crust noticeably lighter.

Finish the Loaf Outside the Dutch Oven

Once the lid has been removed and the loaf has developed its shape, it does not necessarily need to stay on the hot cast iron base for the rest of the bake.

If the bottom is already dark enough, carefully lift the loaf out of the Dutch oven and finish baking it directly on the oven rack.

The crust can continue to brown while the base is no longer sitting against very hot cast iron.

Then Look at Temperature and Preheating

If the bottom is still getting too dark after trying a baking tray and changing the rack position, look at the baking temperature and preheating method in your recipe.

A fully preheated cast iron Dutch oven holds a considerable amount of heat. That is useful for bread, but every oven behaves differently.

Rather than immediately making a large temperature change, make one small adjustment at a time and compare the result on your next loaf.

If your recipe calls for a preheated Dutch oven, there is no need to abandon that method just because the bottom is dark. Try reducing the heat reaching the base first.

Change One Thing at a Time

It can be tempting to change the oven temperature, rack position, preheating time and baking time all at once. The problem is that you will not know which change actually worked.

If your loaf is otherwise baking well, try these in order:

1. Place an empty baking tray on the rack below the Dutch oven.
2. If needed, move the Dutch oven closer to the centre of the oven.
3. If the base is already dark enough, finish the last part of the bake outside the Dutch oven.
4. Only then consider a small adjustment to your baking temperature or preheating method.

The aim is not to stop the bottom crust from browning. You simply want it to finish at roughly the same time as the rest of the loaf.

Your Dutch Oven Probably Is Not the Problem

A dark bottom does not usually mean there is anything wrong with your enamelled cast iron Dutch oven.

It is often just a matter of working out how your particular oven delivers heat and adjusting where the Dutch oven sits within it.

Start with the baking tray underneath. It is the easiest change to make, and for many bakers it is all that is needed.