Stir all additional ingredients in pot and briefly bring to a boil.
Surround one of the cake layers with a springform and spread 1/2 of the hot filling evenly on top. Put the second cake layer gently on top and spread the remaining filling evenly. Put the third cake layer on top and press gently.
Let cake cool down.
Prepare the lemon glaze (provided) as directed and coat the cake evenly.
Perfect your Lemon Cream Cake by decorating it with chocolate flakes or chopped pistachios.