Hi.. I have a family recipe for a cake that I would like to try out, but it's an older one and it includes raw eggs in its filling. I tried thinking out a way to cook the eggs but then I saw it also included whipped whites, so I would require your help. First of all, the yolks. It says to cream 250 gr. butter with 125 gr. powdered sugar and then add 7 yolks one by one. How can I do this in a double boiler? I've done various things in a double boiler but not a cake filling, do I put all things at once, or first cream butter and sugar and then add the yolks? There must be a way and I am sure you know it. Also, the whites. It says to beat 7 whites with 125 gr. powdered sugar and then mix the two fillings and add 200 gr. grated toasted walnuts. However, before we get to that, how can I replace the whites? I would be guessing heavy cream, although how much heavy cream (whipped) is equal to 7 whites and 125 gr. powdered sugar (whipped)? I can't find such thing as preserved eggs or whatever so I will have to use the aforementioned way, hopefully getting some help on how to cook the yolks and substitute the whites. Thanks a lot!