Dark Chocolate Cake with Roasted Strawberry Filling

Dark chocolate cake with roasted strawberry filling pairs a deep cocoa crumb with berries that have been gently roasted until jammy and concentrated. A smooth chocolate ganache keeps the layers together and gives the finished cake a glossy, generous finish. Roasting the fruit first means the filling tastes more like strawberries and less like loose juice, so the cake slices neatly after chilling. It is a celebration cake, but the process is straightforward if you make the berry filling and ganache while the layers cool.

Why You’ll Love This Dark Chocolate Cake with Roasted Strawberry Filling

• Rich but balanced: Dark cocoa and semi-sweet ganache meet the bright, lightly tart flavor of roasted berries.
• Jammy fruit layer: A short roast concentrates the strawberries and makes a filling with more flavor and less excess liquid.
• Make-ahead friendly: Bake the layers a day ahead, wrap them well, and assemble when the filling and ganache are ready.
• Celebration-worthy: A simple ganache finish and a few fresh berries make the cake look special without complicated piping.

Ingredients

This makes one two-layer 8-inch cake, about 12 servings. Use natural or Dutch-process cocoa powder; Dutch-process gives a darker color, while natural cocoa tastes slightly sharper. For the best structure, measure the flour by spooning it into the cup and leveling it rather than scooping straight from the bag.

For the roasted strawberry filling

• 1 pound fresh strawberries, hulled and quartered
• 2 tablespoons granulated sugar
• 1 tablespoon fresh lemon juice
• 1 tablespoon cornstarch
• 1 tablespoon cold water

For the chocolate cake

• 1¾ cups all-purpose flour
• ¾ cup unsweetened cocoa powder
• 1½ cups granulated sugar
• 1½ teaspoons baking powder
• 1½ teaspoons baking soda
• 1 teaspoon fine salt
• 2 large eggs, at room temperature
• 1 cup buttermilk, at room temperature
• ½ cup neutral oil
• 2 teaspoons vanilla extract
• ¾ cup hot brewed coffee

For the ganache

• 12 ounces semi-sweet chocolate, finely chopped
• 1 cup heavy cream
• 2 tablespoons unsalted butter, cut into small pieces
• ½ teaspoon vanilla extract
• Pinch of fine salt

Step-by-Step Instructions

1. Roast the strawberries. Heat the oven to 400°F and line a rimmed baking sheet with parchment. Toss the berries with the sugar and lemon juice, spread them out, and roast for 20 to 25 minutes, stirring once, until soft and surrounded by rosy syrup. Scrape the berries and juices into a small saucepan.
2. Thicken the filling. Bring the berries to a gentle simmer over medium-low heat. Stir the cornstarch and cold water together, then pour the slurry into the pan while stirring. Cook for 1 to 2 minutes, until the juices turn glossy and lightly thickened. Mash some berries with the spoon but leave a few pieces. Transfer to a bowl, cover, and chill completely.
3. Prepare the cake pans. Lower the oven to 350°F. Grease two 8-inch round cake pans, line the bottoms with parchment, and lightly flour the sides. This helps the layers release without tearing their tender edges.
4. Whisk the dry ingredients. In a large bowl, whisk the flour, cocoa, sugar, baking powder, baking soda, and salt until evenly combined. Break up any cocoa lumps. In a separate bowl, whisk the eggs, buttermilk, oil, and vanilla.
5. Make the batter. Pour the wet ingredients into the dry ingredients and whisk just until smooth. Slowly pour in the hot coffee and whisk carefully; the batter will be thin, which helps create a moist cake. Scrape the bottom of the bowl once to make sure no dry pockets remain.
6. Bake the layers. Divide the batter evenly between the pans. Bake for 28 to 33 minutes, until the centers spring back lightly and a toothpick comes out with a few moist crumbs. Cool the cakes in their pans for 15 minutes, then turn them onto racks, remove the parchment, and cool completely.
7. Make the ganache. Put the chopped chocolate in a heat-safe bowl. Warm the cream in a small saucepan just until it steams and small bubbles appear around the edge; do not boil it. Pour the cream over the chocolate and leave it undisturbed for 5 minutes. Add the butter, vanilla, and salt, then whisk from the center outward until smooth. Let the ganache cool, stirring occasionally, until thick enough to spread, about 45 to 60 minutes.
8. Fill and frost the cake. If the cake layers have domed, trim the tops level with a serrated knife. Set one layer on a plate and spread a ring of ganache around the outer edge to create a dam. Spoon the chilled strawberry filling into the center and spread it evenly inside the ring. Add the second cake layer, then cover the top and sides with the remaining ganache. Chill the assembled cake for 30 minutes before slicing. This dark chocolate cake with roasted strawberry filling cuts most cleanly after that short chill; wipe the knife between slices.

If you enjoy chocolate-and-berry desserts, pair a slice with homemade chocolate-covered strawberries or a simple bowl of fresh strawberry shortcake. For another way to use ripe fruit in a bake, see the chocolate banana strawberry loaf.

Tips and Variations

Cool every component before assembly

Warm cake can melt ganache, and warm filling can soften the center of the layers. Let the berries chill in the refrigerator and give the cake layers time to cool completely. If you are short on time, wrap the cooled layers and chill them for 30 minutes; cold cake is easier to handle and less likely to shed crumbs.

Make a neat filling layer

The ganache dam is a useful barrier that keeps berry filling from escaping the sides. Use a piping bag or a small offset spatula to make a ring about ½ inch from the edge. Keep the filling layer modest—roughly ½ cup—so the cake stays stable when stacked. Save extra berry compote for serving.

Choose your chocolate

Semi-sweet chocolate keeps the frosting rich without overwhelming the fruit. If you prefer a darker finish, use bittersweet chocolate and add 1 tablespoon more cream. Milk chocolate makes a sweeter, softer ganache; chill it longer before frosting so it does not slide off the cake.

Decorate simply

Fresh strawberries, chocolate curls, or a dusting of cocoa all work. Add fresh berries just before serving, since cut fruit can release juice onto the ganache as it sits. A spoonful of homemade whipped cream is another easy topping if you want a softer finish.

Do not taste the raw cake batter; it contains flour and eggs that have not been cooked. The FDA explains why raw dough and batter can carry harmful bacteria in its raw dough safety guidance.

Storage and Reheating

Because the filling contains fresh fruit and the ganache contains cream, store the assembled cake covered in the refrigerator for up to 4 days. For the best texture, set slices out for 20 to 30 minutes before serving so the cake and ganache soften slightly. Keep fresh strawberry garnishes separate until just before serving.

To freeze, chill the cake until the ganache is firm, then wrap individual slices tightly and place them in a freezer-safe container for up to 2 months. Thaw overnight in the refrigerator. There is no need to reheat this cake; warming it can loosen the filling and make the ganache oily. If you prefer a softer slice, let it stand at room temperature briefly rather than using the microwave.

Frequently Asked Questions

Can I make dark chocolate cake with roasted strawberry filling ahead?

Yes. Roast and thicken the strawberries up to 2 days ahead and keep them covered in the refrigerator. The cake layers can also be baked a day ahead and wrapped once cool. Make the ganache and assemble the cake the day before serving, then keep it chilled until you are ready to slice.

Can I use frozen strawberries?

Frozen berries can work, but thaw them first and drain off the extra liquid. Roast them until soft, then simmer the fruit with cornstarch as directed. The filling may be a little less chunky, but it will still taste bright and work between the layers.

What if I do not have buttermilk?

Measure 1 tablespoon lemon juice or white vinegar into a measuring cup, then add milk to reach 1 cup. Stir and let it stand for 5 minutes before using. It may look slightly curdled; that is expected and it will blend into the batter.

How do I keep the cake from sliding?

Use fully chilled strawberry filling and a ganache ring around the edge of the bottom layer. Do not overfill the center. Chilling the assembled cake for at least 30 minutes before slicing also firms the ganache and helps each layer stay in place.

Can I use a different frosting?

Yes. Chocolate buttercream or whipped chocolate frosting can replace ganache. Keep the strawberry filling chilled and use a frosting ring to contain it. Ganache gives the most pronounced chocolate flavor, while a lighter frosting lets the berries stand out more.