Sourdough Discard Lemon Blueberry Bread (Active Starter Works Too)

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This sourdough discard lemon blueberry bread is one of those recipes that feels like spring no matter what time of year you make it. Fresh lemon zest, fresh lemon juice and frozen blueberries folded into a tender, lightly sweet loaf. It gets a lemon glaze poured on while it is still warm and soaks straight in. Two loaves come out of one batch, which means you have one to keep and one to give away.

You do not need an active starter for this. Discard works perfectly. The starter is here for a little tang and depth of flavor, not for lift. Baking powder and baking soda do that work. If you do have an active starter you want to use up, that works too. Either way, measure it by weight. 120 grams.

If you want to understand more about the difference between active sourdough starter and discard, check out my blog on Sourdough Starter.

Supplies You’ll Need for Sourdough Discard Lemon Blueberry Bread

Here is everything I used for this recipe.

(Affiliate links below.)

Kitchen Scale – Measure your starter accurately every time. 120g is the target.

TempPro Instant Read Thermometer – Skip the toothpick test. This is the only reliable way to know your bread is done.

Loaf Pan Parchment Inserts – Line your pans without greasing. A small spritz of cooking spray keeps the liner from sliding when you pour the batter.

Disposable Aluminum Loaf Pans with Lids 50 Pack – Perfect if you are baking to give one away. Bake it, glaze it and hand it over without worrying about getting your pan back.

If you want to see everything I keep in my sourdough kitchen, I have a full breakdown in my sourdough baking tools post.

How to Make Sourdough Discard Lemon Blueberry Bread

Start with fresh lemons. Not bottled juice. The zest is what makes this bread taste like lemon instead of just sweet, and you cannot get that from a bottle. You need one tablespoon of zest and two tablespoons of fresh juice. Zest your lemons first, then juice them. It is much easier in that order.

Your starter goes in with the wet ingredients. Measure it by weight, 120 grams, whether you are using active starter or discard. If you are pulling discard straight from the refrigerator, no feeding needed. Give it a quick stir and measure it out. The starter adds a subtle tang that balances the sweetness of the glaze really well.

Combine all your wet ingredients in one bowl and your dry ingredients in another. Pour wet into dry and stir until just combined. Do not over-mix.

Once you see the flour disappear, stop.

Now the most important step before your batter goes into the pans. Toss your frozen blueberries in one to two tablespoons of flour before you fold them in. Do not skip this. The flour coating absorbs the excess moisture from the frozen berries and keeps them suspended in the batter instead of sinking to the bottom. I learned this the hard way.

Divide the batter evenly between your two prepared pans. If you are using parchment inserts, a small spritz of cooking spray on the bottom of the pan keeps the liner from sliding when you pour.

Bake at 350 degrees Fahrenheit for 50 minutes.

Pull them out and let them cool for five to ten minutes before glazing. You want them warm, not hot. The glaze soaks in better when the bread has settled a little. Mix your powdered sugar and fresh lemon juice until it ribbons off a spoon and pour it over both loaves while they are still in the pans.

The gifting note. These bake up perfectly in disposable aluminum loaf pans with lids. Bake it, glaze it right in the pan and snap the lid on. No transferring, no wrapping, no worrying about getting your pan back. These are on Amazon in a 50 pack and they are worth having on hand any time you are baking for someone else.

What Went Wrong the First Time (And How to Avoid It)

I am going to be honest with you because that is the whole point of this blog. The first time I made this bread, I made every mistake in the book. All at once.

I forgot the milk. I noticed the second I set the pans down and turned around. So I pulled them back out, dumped the batter into the bowl and stirred it in. But the frozen blueberries had already started to melt without the flour coating. The added milk combined with the watery blueberries turned the whole batter purple and soupy. It went into the oven anyway.

Then I used the toothpick test to check for doneness. It came out clean, so I pulled the loaves. By the time they were cooling on the rack the centers had already started to fall. Doughy in the middle, fully baked on the outside. The toothpick lied.

I scooped out the fallen doughy centers and threw them into a muffin tin to try to save what I could. The muffins actually turned out the best of anything that day.

I learned from my mistakes so you don’t have to, I have perfected the recipe that works consistently, and that is the one you are going to make.

If you want to put your starter to work, here are a few options to make next; Sourdough Hawaiian Rolls and Sourdough Plain Bagels are two of my families favorites.

Pro Tips for the Best Sourdough Discard Lemon Blueberry Bread

Flour your frozen blueberries. Toss them in one to two tablespoons of flour before you fold them into the batter. This absorbs the excess moisture from the frozen berries and keeps them suspended throughout the loaf instead of sinking straight to the bottom. Skip this step and your blueberries will end up exactly where mine did the first time.

Measure your starter by weight. Volume measurements for starter are unreliable because the density changes depending on how active or how deflated it is. 120 grams on a kitchen scale is the same every single time.

Use parchment inserts. Parchment pan liners mean you never have to grease your pans and cleanup is almost nothing. A small spritz of cooking spray in the pan before you drop the liner in keeps it from sliding when you pour the batter.