Chocolate Mousse-Blackberry Birthday Cake

My youngest child, my baby daughter has turned 15. I still remember the day she came into this world and into my life. I felt immeasurably happy and blessed to hold my little bundle of joy in my arms. I miss those days when she was so dependent on me and when I could spend every minute taking care of her, cuddling her and kissing her chubby cheeks. I miss dressing her for school, brushing her hair, playing with her, coloring together. I even miss buying toys! 🙂 I got a bit misty eyed remembering the good old days, but I am delighted to see her growing up to be a beautiful, smart, artistic and caring young lady. Can a mother ever say enough of great things about her child? 🙂

As she has a beautifully distinguished character, so her wish for a birthday cake was a bit unusual as well: A Blackberry Cake. Birthday blackberry cake was certainly a challenge, but it turned out super delicious!

Chocolate Mousse-Blackberry Birthday Cake                    Printable recipe

Cake:

  • 3 eggs
  • 3 tbsp water
  • ½ cup (100 g) sugar
  • 1 pack vanilla sugar (or 1 tsp vanilla extract)
  • 2.6 oz (75 g) flour
  • 1.7 oz (50 g) corn starch
  • 1 tsp baking powder

Chocolate mousse:

  • 2 cups (500 ml) chilled heavy cream
  • 4 egg yolks
  • 3 tablespoons sugar
  • 1 teaspoon vanilla
  • 4.4 oz (125 g) semi-sweet chocolate
  • 2.6 oz (75 g) milk chocolate

Frosting and decoration:

  • 1 cup (250 ml) heavy cream
  • 4 tbsp sugar
  • 1 pack vanilla sugar (or 1 tsp vanilla extract)
  • 5.2 oz (150 g) semi-sweet chocolate
  • 24 oz (700 g) blackberries
  • 1-2 tbsp powder sugar
  • Blackberry leaves for decoration

Cake preparation:

Divide eggs. Beat egg whites with 3 tbsp water until foamy. Slowly add sugar and vanilla, mix for couple of minutes, then add one by one egg yolk. Combine flour, corn starch and baking powder. Gently fold into egg mixture. Pour the batter into a 9 inch (23 cm) spring form cake pan lined with parchment paper. Bake at 365 F (185 C) 20 – 30 minutes. Cool completely and then slice through into two equal pieces.

Chocolate mousse preparation:

Heat  3/4 cup (125 ml) cream in a 1-quart heavy saucepan until hot. Whisk together yolks, sugar, and a pinch of salt in a metal bowl until combined well, then add hot cream in a slow stream, whisking until combined. Transfer mixture to saucepan and cook over moderately low heat, stirring constantly, until it registers 160°F (71 C)on thermometer. Pour custard through a fine-mesh sieve into a bowl and stir in vanilla.

Melt chocolate in a metal bowl set over a pan of simmering water stirring frequently. Whisk custard into chocolate until smooth, then cool. Beat remaining 1 1/4 (375 ml)cups cream in a bowl with an electric mixer until it just holds stiff peaks. Whisk one fourth of cream into chocolate custard to lighten, then fold in remaining cream gently but thoroughly.

Place the bottom cake part back into the spring form. Pour the chocolate mousse onto the cake. Cover and leave it in the fridge for at least 4 hours. Do not put top cake piece over the mousse as it is still very soft. Cover with plastic wrap and save it until ready to ensemble the cake.

Prepare frosting and decoration:

Whip heavy cream until firm, add sugar and vanilla. Cover and leave in the fridge until ready to ansamble the cake. Melt the chocolate in a metal bowl placed over a pot of simmering water. Spread the melted chocolate in two thin ribbons on piece of parchment paper, place it in the freezer. Make sure each ribbon is at least 3 inches (7-8 cm) high.

Wash blackberries and place them on a kitchen towel to dry.

Ensamble the cake:

  1. Remove the spring form with mousse from the fridge. If the mousse is firm enough, place the second sponge cake on the top.
  2. Remove the cake from the spring form and place it onto a serving plate. Frost the cake all around with whipped cream.
  3. Remove the chocolate ribbons from the freezer. Break them up into 1 – 2 inch pieces. Make sure pieces are little higher than the cake. Place the pieces around the cake to form a „fence“.
  4. Place the blackberries on the top of the cake. If desired, dust with powder sugar and decorate with blackberry leaves.

Enjoy! 🙂

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38 thoughts on “Chocolate Mousse-Blackberry Birthday Cake

        1. I try to be the best mom I can be, so she can pass it on to her children one day. 🙂 I had the best mom in the world, but she passed early. I always tried to be like her…

  1. Your daughter is so beautiful!! Happy Birthday!! I think your cake has to be the prettiest I’ve seen in a long while, I love the large shards of chocolate along the sides and the pretty pattern of berries on top!!

    1. Hi Kathleen,
      Thank so much! 🙂 I used 9 inch (23 cm) spring form. I forgot to add that to the recipe. I will go back and update. Have a great Sunday!

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