How to Bake a chocolate cake without flour

A cake for people with a gluten allergy, and for anyone who just likes chocolate. The only ingredients for this cake are semi-sweet chocolate, eggs, sugar, butter, vanilla, and an optional shot of espresso. To make the cake you first need to preheat the oven and grease the pan. After that you melt the chocolate with the butter and let in cool while you separate the eggs. After the eggs are separated, mix the yolks with half the sugar, and beat until fluffy. Add the cooled chocolate mixture to the yolk mixture and stir until combined. Then beat the egg whites until soft peaks form. Add sugar to the stiffened whites gradually. Fold the whites into the chocolate mixture in three batches, being careful not to deflate the eggs. Pour the batter into the pan and cook for about 50 min. Enjoy with some whipped cream!!