METHOD
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Melt the chocolate
Preheat the oven to 190°C / 375 °F. Melt the chocolate and butter in a bowl set over a saucepan of simmering water. Add the freshly brewed strong espresso and salt to the chocolate and butter mix, stir well and remove from the heat to cool.
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Beat the eggs and sugar
Beat the eggs and sugar until thick and pale, about 5 minutes in a bowl set over a saucepan of simmering water.
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Combine
Pour the chocolate mixture into the egg mixture and beat for another 2 - 3 minutes. Add the hazelnut flour and unsweetened cacao and stir well, using a spatula.
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glaze
Prepare the glaze. In a saucepan bring the sugar, cacao and freshly brewed strong espresso to a boil. Simmer for 2 minutes, stirring constantly. Set aside until needed.
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bake and serve
Grease the cake pan with butter. Lower the oven temperature to 175°C / 350 °F. Pour the batter into the cake pan and bake until set, for about 40 minutes. Serve with cacao glaze and/or vanilla ice cream.