Sourdough Lemon Cake

If you have extra sourdough starter sitting in your kitchen and you’re looking for a delicious way to use it, this Sourdough Lemon Cake is the perfect recipe. Soft, moist, and bursting with fresh lemon flavor, this cake transforms simple ingredients into a bright and refreshing dessert. The sourdough discard adds a subtle tang and incredible moisture without making the cake taste sour.

This lemon cake is ideal for spring gatherings, summer picnics, afternoon tea, birthdays, or whenever you’re craving a light and citrusy dessert. Topped with a sweet lemon glaze, every bite delivers the perfect balance of sweetness and tanginess.

One of the best things about this recipe is that it helps reduce food waste by putting your sourdough discard to good use. Even people who don’t usually enjoy sourdough bread will love this cake because the starter simply enhances the texture and flavor.

Why You’ll Love This Recipe

• Perfect use for sourdough discard
• Soft and moist crumb
• Bright fresh lemon flavor
• Easy to make with pantry ingredients
• Delicious for dessert or brunch
• Freezes beautifully
• Family-friendly recipe

Ingredients

For the Cake

• 1 cup sourdough discard
• 2 cups all-purpose flour
• 1½ teaspoons baking powder
• ½ teaspoon baking soda
• ½ teaspoon salt
• 1 cup granulated sugar
• ½ cup unsalted butter, softened
• 2 large eggs
• 1 teaspoon vanilla extract
• ½ cup milk
• Zest of 2 lemons
• ¼ cup fresh lemon juice

For the Lemon Glaze

• 1 cup powdered sugar
• 2 to 3 tablespoons fresh lemon juice
• 1 teaspoon lemon zest

Kitchen Equipment

• Mixing bowls
• Electric mixer
• Measuring cups and spoons
• Rubber spatula
• 9-inch cake pan or loaf pan
• Cooling rack

Instructions

Step 1: Preheat the Oven

Preheat your oven to 350°F (180°C).

Grease a 9-inch cake pan or loaf pan and lightly dust it with flour. You can also line the pan with parchment paper for easy removal.

Step 2: Prepare the Dry Ingredients

In a medium bowl, whisk together:

• Flour
• Baking powder
• Baking soda
• Salt

Mixing the dry ingredients separately helps ensure even distribution throughout the cake.

Set aside while you prepare the wet ingredients.

Step 3: Cream Butter and Sugar

In a large mixing bowl, beat the softened butter and sugar together until light and fluffy.

This process usually takes about 2 to 3 minutes with an electric mixer.

The mixture should become pale and airy, helping create a tender cake texture.

Step 4: Add the Eggs

Add the eggs one at a time.

Beat well after each addition to ensure everything combines smoothly.

Stir in the vanilla extract.

The batter should now appear creamy and smooth.

Step 5: Add Lemon Flavor

Add the fresh lemon zest and lemon juice to the mixture.

The aroma of fresh lemon will immediately brighten the batter.

Using both juice and zest provides the strongest and freshest citrus flavor.

Step 6: Mix in the Sourdough Discard

Add the sourdough discard and mix until fully incorporated.

The discard helps create an exceptionally moist cake while adding a slight tang that complements the lemon perfectly.

Don’t worry if the mixture looks slightly curdled at this stage. Everything will come together once the flour is added.

Step 7: Combine Wet and Dry Ingredients

Gradually add the dry ingredients to the wet ingredients, alternating with the milk.

Start with one-third of the flour mixture, then add some milk.

Continue alternating until all ingredients are combined.

Mix only until no dry flour remains.

Overmixing can make the cake dense instead of light and fluffy.

Step 8: Fill the Pan

Pour the batter into the prepared cake pan.

Use a spatula to spread it evenly.

Tap the pan gently on the counter to remove any large air bubbles.

Step 9: Bake

Place the cake in the preheated oven.

Bake for 35 to 40 minutes if using a round cake pan.

If using a loaf pan, baking may take 45 to 55 minutes.

The cake is done when:

• The top is lightly golden
• A toothpick inserted into the center comes out clean
• The cake springs back when lightly touched

Step 10: Cool Completely

Remove the cake from the oven and allow it to cool in the pan for about 15 minutes.

Transfer it to a wire rack and let it cool completely before adding the glaze.

Glazing a warm cake can cause the icing to melt too much.

Make the Lemon Glaze

In a small bowl, combine:

• Powdered sugar
• Fresh lemon juice
• Lemon zest

Whisk until smooth.

If the glaze is too thick, add a little more lemon juice.

If it becomes too thin, add extra powdered sugar.

The glaze should be thick enough to slowly drip down the sides of the cake.

Glaze the Cake

Once the cake has cooled completely, drizzle the lemon glaze evenly over the top.

Allow the glaze to set for about 15 minutes before slicing.

The glaze adds extra sweetness and an additional burst of lemon flavor.

Serving Suggestions

This Sourdough Lemon Cake pairs wonderfully with:

• Fresh berries
• Whipped cream
• Vanilla ice cream
• Hot tea
• Coffee
• Lemon curd

Serve it as a simple afternoon treat or dress it up for special occasions.

Helpful Tips

Use Fresh Lemons

Fresh lemon juice and zest provide much better flavor than bottled lemon juice.

The zest contains natural oils that add incredible citrus aroma.

Don’t Overmix

Once the flour is added, mix gently.

Overmixing develops gluten and can make the cake tough.

Room Temperature Ingredients

Butter, eggs, milk, and sourdough discard should be at room temperature.

This helps everything combine smoothly and bake evenly.

Test Before Removing

Every oven is slightly different.

Always use a toothpick test before removing the cake from the oven.

Storage Instructions

Room Temperature

Store the cake in an airtight container for up to 2 days.

Refrigerator

For longer storage, refrigerate for up to 5 days.

Allow slices to come to room temperature before serving for the best texture.

Freezer

Wrap individual slices or the whole cake tightly in plastic wrap and foil.

Freeze for up to 3 months.

Thaw overnight in the refrigerator before serving.

Variations

Lemon Blueberry Sourdough Cake

Fold 1 cup fresh blueberries into the batter before baking.

Lemon Poppy Seed Cake

Add 2 tablespoons poppy seeds to the batter for a classic flavor combination.

Lemon Cream Cheese Cake

Spread a layer of cream cheese frosting over the cooled cake instead of using the glaze.

Lemon Coconut Cake

Mix ½ cup shredded coconut into the batter for added texture and flavor.

Final Thoughts

This Sourdough Lemon Cake is a wonderful way to transform extra sourdough discard into a bright, flavorful dessert. The combination of fresh lemon juice, fragrant lemon zest, and moist sourdough cake creates a treat that’s light, refreshing, and incredibly satisfying. Whether you’re serving it at a family gathering, enjoying it with afternoon tea, or simply looking for a creative way to use sourdough discard, this cake is sure to become a favorite recipe you’ll make again and again.