Preheat oven to 180°C (fan bake). Line a 23cm springform tin with parchment paper.
In a large bowl, sift together flour, cocoa powder, baking powder, and baking soda. In a cup, dissolve instant coffee in boiling water.
Add the coffee mixture, melted butter, sugar, vanilla, egg, and milk to the dry ingredients. Mix until smooth.
Pour batter into the prepared tin and bake for 25-30 minutes. Cool completely in the tin.
In a small bowl, combine gelatine with 2 tablespoons cold water and let bloom for 5 minutes. Heat 1/3 cup of cream with sugar until dissolved. Add bloomed gelatine.
Add 200g chocolate to the saucepan and whisk until melted. Allow to cool slightly.
In a separate bowl, whip the remaining cream until soft peaks form. Fold a quarter into the chocolate mixture, then gently fold in the rest.
Pour the mousse over the cooled cake base and smooth the top. Grate the remaining chocolate over the mousse.
Refrigerate for at least 4 hours or overnight. Carefully remove from the tin and serve chilled.
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Notes
Store in the refrigerator for up to 3 days. Freezing is not recommended.