Chocolate Cake in a Jar
Melt the chopped dark chocolate over a hot water bath. Beat the butter and powdered sugar until fluffy. Separate the eggs. Gradually beat in the egg yolks and melted chocolate.
Whip the egg whites with the sugar until stiff then carefully fold into the chocolate batter. Mix the flour, ground almonds and chopped bittersweet chocolate together and fold in. Pour the batter into the glasses and bake in a preheated oven at 160°C (approximately 325°F) for 40 minutes. Remove from the oven, cover with the lids and let cool.