Crush the biscuits into small pieces. Add them melted butter and mix well until a homogeneous mixture. Spread the mixture into the pan and forms a ledge at the end. No need to be greased pan with fat. Pour the sugar in a large pan and cook until caramelized. Add to the pan of sliced ​​apples and cook gently stirring until the caramel has dissolved (apple juice and put the caramel hardens initially) and cover them from all sides. Add rum, stir and remove from fire. Spread the caramelized apples on a biscuit base. Beat the egg yolks and mix with the cream and vanilla extract. Pour the apples with the mixture, place in oven heated to 160C and bake for about 40 minutes. After removing the cake from the oven let it cool completely in shape before removing it.