Melt chocolate in a heat proof bowl over a saucepan of simmering water, then set aside to cool.
Beat butter and sweetener in a bowl until thick and pale, then add egg yolks, one at a time and beating well after each addition.
Add the melted chocolate, vanilla and almond meal and mix until combined. In a separate bowl, beat egg whites until stiff peaks are formed, and then fold into cake mixture. Spoon the mixture into the cake pan, then bake for 10 minutes.
Reduce the heat to 170℃, then bake for another 7-10 minutes.
Take out and cool on a baking tray.
Top with Chocolate Mousse and refrigerate to set.
THERMOMIX RECIPE
Insert butterfly and whisk egg whites 3 minutes / speed 3.5 or until stiff peaks form. Scrape into a bowl to reserve.
Add butter and sweetener to bowl and mix 3 minutes / speed 3.
While it is mixing remove MC and add egg yolks one at a time, beating for 10 seconds between.
Add the the melted chocolate, vanilla and almond meal, and mix for a further 1 minute / speed 3 until well blended.
Fold into egg whites and follow cooking instructions as above.
Notes
So delicious! For a bit of a change add some orange essential oil for a tasty jaffa version