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Preheat the oven to 160 degrees and grease the pan well.
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In a bowl of mixer, whip eggs, sugar and salt at high speed until you get an airy, light foam.
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Lower the speed of the mixer and add the oil in a thin stream, stirring slowly until it is incorporated in the mixture.
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Add the water in a thin stream and continue to whisk until blended.
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Add almond meal, cocoa and baking soda and blend until combined.
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Pour the batter into the pan and bake for 35-45 minutes or until the cake is swelling, set at the edges and springy to the touch.
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Cool at room temperature. During cooling the cake sinks a little in the center and that's fine.
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Chocolate ganache: chop the chocolate and put in a bowl.
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Add the cream and melt together in a microwave or over double-boiler, until everything is melted and the mixture is smooth.
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10. Pour the ganache over the cake and let it drain into the sides as well.
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11. Cool the cake for 2-3 hours in the refrigerator until the ganache is completely set.
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12. Remove from the pan and decorate with hazelnuts.
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13. Serve the cake at room temperature.