The milk is heated and it put the beaten yolks and flour. You can add a little hot water in the mix yolks and flour can be added to the warm milk, stirring. Get out of the heat. In another saucepan pour the sugar is caramelized and a light caramel. Pulls from heat. Pour a the walnuts and the chopped butter, stirring. Again put on the stove and pour, stirring the mixture with the milk. Boil, stirring no more than 5 minutes. With the finished hot cream is poured over the bases, such as lining up on one another. The cake is decorated optional.