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Prepare the sourdough starter: In a large glass jar, combine the active sourdough starter, 1/2 cup all-purpose flour, and 1/2 cup warm water. Stir until well combined and no dry spots remain. Cover loosely with a lid or plastic wrap and let it ferment at room temperature for 2-4 hours, or until bubbly and active. This will be your sourdough discard for the cake.

Preheat your oven to 350°F (175°C). Grease and flour two 8-inch round cake pans, or line with parchment paper.

In a large bowl, whisk together the 1 3/4 cups all-purpose flour, granulated sugar, 3/4 cup unsweetened cocoa powder, baking soda, baking powder, and 1 teaspoon salt. Make sure there are no lumps.

In a separate medium bowl, whisk together the large eggs, buttermilk, vegetable oil, vanilla extract, and the prepared active sourdough discard from Step 1.

Pour the wet ingredients into the dry ingredients and mix until just combined. Do not overmix.

Carefully stir in the hot water until the batter is smooth and slightly thinned. The batter will be thin.

Divide the batter evenly between the two prepared cake pans.

Bake for 25-30 minutes, or until a wooden skewer inserted into the center of the cakes comes out clean. Let the cakes cool in the pans for 10 minutes before inverting them onto a wire rack to cool completely.

While the cakes cool, prepare the chocolate frosting: In a large bowl, using an electric mixer, beat the softened unsalted butter until light and fluffy.

Gradually add the 3/4 cup unsweetened cocoa powder and powdered sugar, alternating with the heavy cream, beating until smooth and creamy. Add the 1 teaspoon vanilla extract and 1/4 teaspoon salt, and beat until well combined and fluffy.

Once the cakes are completely cool, level the tops if necessary. Place one cake layer on a serving plate. Spread a generous layer of frosting over the top. Place the second cake layer on top and cover the entire cake with the remaining frosting, smoothing the sides and top.

Slice and serve this rich, moist sourdough chocolate cake.


Prepare the sourdough starter: In a large glass jar, combine the active sourdough starter, 1/2 cup all-purpose flour, and 1/2 cup warm water. Stir until well combined and no dry spots remain. Cover loosely with a lid or plastic wrap and let it ferment at room temperature for 2-4 hours, or until bubbly and active. This will be your sourdough discard for the cake.

Preheat your oven to 350°F (175°C). Grease and flour two 8-inch round cake pans, or line with parchment paper.

In a large bowl, whisk together the 1 3/4 cups all-purpose flour, granulated sugar, 3/4 cup unsweetened cocoa powder, baking soda, baking powder, and 1 teaspoon salt. Make sure there are no lumps.

In a separate medium bowl, whisk together the large eggs, buttermilk, vegetable oil, vanilla extract, and the prepared active sourdough discard from Step 1.

Pour the wet ingredients into the dry ingredients and mix until just combined. Do not overmix.

Carefully stir in the hot water until the batter is smooth and slightly thinned. The batter will be thin.

Divide the batter evenly between the two prepared cake pans.

Bake for 25-30 minutes, or until a wooden skewer inserted into the center of the cakes comes out clean. Let the cakes cool in the pans for 10 minutes before inverting them onto a wire rack to cool completely.

While the cakes cool, prepare the chocolate frosting: In a large bowl, using an electric mixer, beat the softened unsalted butter until light and fluffy.

Gradually add the 3/4 cup unsweetened cocoa powder and powdered sugar, alternating with the heavy cream, beating until smooth and creamy. Add the 1 teaspoon vanilla extract and 1/4 teaspoon salt, and beat until well combined and fluffy.

Once the cakes are completely cool, level the tops if necessary. Place one cake layer on a serving plate. Spread a generous layer of frosting over the top. Place the second cake layer on top and cover the entire cake with the remaining frosting, smoothing the sides and top.

Slice and serve this rich, moist sourdough chocolate cake.
