Preheat the oven to 160 °C or 320°F
Grease your cake form with some butter and a handful breadcrumbs (optional)
Using a hand or stand mixer whisk the egg whites with a pinch of salt until you achieve some stiff peaks.
In a separate bowl add caster sugar, vanilla sugar or extract, egg yolks and butter and mix until you achieve a nice creamy consistency.
Add the cocoa powder, chocolate chips and cinnamon to the bowl and combine everything to a homogenous mass.
Mix the flour and baking powder. Little by little add the red wine and flour to the cake batter, alternating between the two. Mix until everything is combined.
Lastly, carefully fold the egg whites into the batter.
Pour the dough into the prepared cake tin and place the tin into the oven.
The red wine cake has to bake for about 60 min. Check after an hour with a knife or skewer if the cake is done. If the knife/ skewer comes out clean it is done.
Leave the cake to cool before serving it on a platter.
You can decorate the cake by glazing it with a chocolate glaze or you can dust it with icing sugar. To make the red wine glaze mix 100 gr (1 cup) icing sugar with 2 tablespoon red wine to a thick mass and pour over the cake.