1Begin by melting the dark chocolate and unsalted butter together over a double boiler or in the microwave in 30-second intervals, stirring until smooth.
Separate the egg yolks from the whites. Beat the yolks with 1 tablespoon of sugar until pale and creamy.
In a separate bowl, whip the egg whites, gradually adding the remaining sugar until stiff peaks form.
Fold the melted chocolate mixture into the egg yolks, then gently fold in the egg whites, maintaining as much air as possible.
Dissolve the gelatin powder in the water and heat gently until fully dissolved. Allow to cool slightly, then mix into the chocolate mixture.
In another bowl, whip the heavy cream to soft peaks, then fold into the chocolate mixture along with the cayenne pepper and cinnamon.
Pour the mixture into a prepared mold lined with a thin layer of almond flour and icing sugar mixture (combine and sift the almond flour and icing sugar to create this layer).
Refrigerate the entremet for at least 4 hours, or until set.
Once set, remove from the mold and finish with a dusting of icing sugar and a sprinkle of cinnamon before serving.