Fudge Cake with yolk

1 cup sugar 1/2 cup Dutch-processed cocoa powder 1 cup all-purpose flour 2 teaspoons baking powder 1/4 teaspoon salt 1/2 cup milk 4 tablespoons unsalted[...]

2 teaspoons instant coffee granules , dried 1 1/2 cups water 2/3 cup Dutch-processed cocoa powder 1/3 cup packed brown sugar 1 cup granulated sugar 6[...]

1 tablespoon butter 6 tablespoons sugar 2 tablespoons flour 1 pinch salt 1 melted chocolate square 1 egg 1 cup milk 1 Beat egg white until stiff. 2 Cream[...]