- 1.   Preheat the oven to 180°C (350°F). 
- 2.   Cream the softened butter and sugar together for 3 minutes in the bowl of a stand mixer fitted with the paddle attachment, or by hand using a wooden spoon. Then add the almond powder, mix well, and gradually incorporate the eggs one by one. Mix until the sugar is dissolved. 
- 3.   Sift the flour, then gradually incorporate it into the mixture until you have a smooth and homogeneous batter. 
- 4.   Grease and flour a 25 cm (10 inch) round cake pan, pour in the batter, and bake for 35 to 40 minutes. 
- 5.   Let the cake cool for a few minutes, then remove it from the pan. Immediately brush the top with 4 cl (1.35 fl oz) of rum to soak it. Let it cool completely. 
- 6.   Mix the powdered sugar, the remaining rum, and a little water: you should obtain a smooth glaze that is not too liquid; if necessary, add more powdered sugar. Spread it over the top of the cake. Let it harden.