This recipe shows you how to make a pudding cake that lets you enjoy smooth custard pudding and fluffy sponge cake at the same time. First, make caramel sauce by boiling sugar and water in a pot and pour it into a heat-resistant container. Next, make custard by warming milk, heavy cream and vanilla extract and gradually adding it to a mixture of whole eggs and sugar. Then, make sponge cake batter by whisking whole eggs and sugar, adding cake flour and milk, and pour it over the custard. Bake in a water bath in the oven, then chill in the refrigerator overnight and remove from the mold to finish. This is a luxurious dessert that you can easily make at home, offering a combination of melt-in-your-mouth pudding and light cake.