How to cook
Separate the egg whites from the yolks (the eggs need to be at room temperature). To the whites, add most of the sugar and beat with a mixer to a thick consistency.
Beat the egg yolks with the remaining sugar until whitened. Dissolve the aspirin in the cool water. Combine the whites with the yolks, add the water with the aspirin, the vanilla and stir. Gradually add the flour and stir until you obtain a thick cake dough.
Pour the mixture into a heated and oiled form and bake in a moderate oven until ready. Take the ready cake (you can check with a toothpick) out of the form and sprinkle with powdered sugar.