The inspiration for this cake is the mousse-like chocolate cake at Diner, in Williamsburg, Brooklyn. It’s an intense, light, pure chocolate experience.
Melt the butter, chocolate and cocoa powder together over low heat, in a double boiler or in the microwave. Beat the egg whites with half the sugar and the salt until stiff peaks form. Beat the yolks with the remaining sugar, sour cream and vanilla until smooth. Combine the egg yolk mixture with the melted chocolate mixture, then fold in the egg white mixture until the mixture is incorporated.
Pour the batter into the tin and place the tin inside a larger baking dish. Pour boiling water into the larger dish to three-quarters of the height of the cake tin.
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