I came across this recipe and was interested because the leavening agent is (AIR!) whipping the egg whites gives this "pudding" the lift. No baking powder required. To describe this a bit better the top part ended up being very cake like and the bottom 1/4 inch had a similar consistency to pudding. This was all the same batter so as the air bubbles rise to the top during the cooking process the bottom bit becomes more dense and stays hydrated longer resulting in the custard. I will say I did enjoy the texture, however, it needed some sort of crunch and the sweetness and lemon flavor could be amped up a bit. The topping in the last picture is fresh whipped cream (no cool whip here). I added vanilla, sugar, and salt which added a few points to the dessert. https://thebakerupstairs.com/2013/01/irish-lemon-pudding-2.html