Chocolate sponge cake and buttercream: you have to try it

Ingredients:
COCOA SPONGE CAKE:50g seed oil55g dark chocolate35g cream15g cocoa powder60g all purpose flour1 pinch salt15g milk4 eggs65g sugarCHOCOLATE BUTTERCREAM:220g butter3 egg whites142g sugar1 pinch salt110g dark chocolate12g cocoa powderCHOCOLATE GANACHE:60g dark chocolate80g cream

Directions:
1. Melt dark chocolate with cream and seed oil.
2. Then add the egg yolks and sift the flour and cocoa.
3. Mix milk and beaten egg whites.
4. Pour the mixture into the mold and bake at 170° for 35 minutes.
5. Buttercream: Mix egg whites with sugar and salt. Then add the butter, cocoa and melted dark chocolate.
6. Also prepare the ganache by melting the chocolate with the cream.
7. Assemble and enjoy this wonderful cake.