Step-by-Step Instructions

1. Prepare the Chocolate Cake:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans. You can also line the bottoms with parchment paper to prevent sticking.
2. Mix Dry Ingredients: In a large bowl, sift together the all-purpose flour, cocoa powder, baking powder, baking soda, and salt. Set aside.
3. Mix Wet Ingredients: In a separate bowl, whisk the granulated sugar, brown sugar, eggs, vanilla extract, milk, and vegetable oil (or melted butter). Make sure everything is well combined.
4. Combine Wet and Dry Ingredients: Gradually add the wet ingredients to the dry mixture, stirring gently until combined. The batter will be thick but smooth.
5. Add Boiling Water: Carefully add the boiling water (or hot coffee) to the batter. This will loosen up the mixture, but don’t worry; it will make the cake extra moist.
6. Bake the Cake: Pour the batter evenly into the prepared cake pans. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Allow the cakes to cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely.

2. Make the Strawberry Filling:

1. Cook the Strawberries: In a saucepan, combine chopped strawberries, sugar, and lemon juice. Cook over medium heat, stirring occasionally, for 10-15 minutes until the strawberries break down and release their juices.
2. Thicken the Filling (Optional): If you prefer a thicker filling, mix 1 tablespoon of cornstarch with a small amount of cold water to make a slurry. Add this mixture to the strawberry filling and cook for an additional 2-3 minutes, until the filling thickens.
3. Cool the Filling: Remove from heat and stir in the vanilla extract. Let the filling cool to room temperature.

3. Make the Frosting:

1. Prepare the Buttercream: In a mixing bowl, beat the softened butter on medium speed for 1-2 minutes until smooth and creamy. Gradually add powdered sugar, a little at a time, beating until fully incorporated.
2. Add Cocoa Powder and Vanilla: Sift in the cocoa powder and add vanilla extract. Mix on low speed until the frosting is smooth and fully combined.
3. Adjust Consistency: If the frosting is too thick, add 1 tablespoon of milk or cream at a time until the desired spreadable consistency is reached. A pinch of salt helps balance the sweetness.

4. Assemble the Cake:

1. Layer the Cake: Once the cakes have cooled completely, level them if necessary. Place one layer of the cake on your serving plate.
2. Add the Strawberry Filling: Spread a generous layer of the cooled strawberry filling over the first cake layer, making sure to leave a small border along the edges.
3. Top with the Second Layer: Place the second layer of cake on top of the strawberry filling, gently pressing it down to ensure it sticks.
4. Frost the Cake: Spread a smooth layer of the chocolate frosting over the top and sides of the cake using an offset spatula or butter knife. You can smooth out the frosting or create a decorative swirl pattern.
5. Decorate (Optional): Optionally, garnish the cake with fresh strawberry slices or chocolate shavings for added decoration.

5. Serve and Enjoy:

1. Chill the Cake (Optional): Refrigerate the cake for 30 minutes to allow the frosting to set and the flavors to meld. This step helps achieve clean slices when cutting the cake.
2. Slice and Serve: Slice the cake into generous portions and serve with a hot cup of coffee, tea, or a glass of milk for a perfect treat.