American
Heat the oven to 180C and grease and line two 20 cm round cake tins.
Beat 90 g of the butter with the sugar until light, then beat in the eggs one at a time and 1 tsp of the vanilla.
Mix the flour, 30 g of the cocoa, the baking soda, baking powder and salt, and add them to the butter mixture in turns with the milk.
Stir in the hot coffee to make a smooth batter and divide it between the tins.
Bake for 22-25 minutes, until a skewer comes out clean, then cool in the tins for 10 minutes and turn out onto a rack to cool completely.
For the frosting, beat the remaining 120 g of butter until pale, then beat in the powdered sugar, the remaining cocoa, the cream and the remaining vanilla until fluffy.
Sandwich the layers with a third of the frosting and spread the rest over the top and sides.