Let the apples rest, and begin by separating the egg whites from the yolks.

Beat the egg whites until very stiff, and keep them in the fridge covered while you beat the yolks with the sugar until foamy.

Once foamy, take the flour, add the baking powder, milk, and melted butter. Begin to incorporate the ingredients with a spatula, or a stand mixer on very low speed. Shortly after, add the yolk and sugar foam and continue to incorporate.

Once you have a smooth consistency without lumps, stop using the stand mixer and use your hands. Gently fold in the beaten egg whites from the fridge, a little at a time, from bottom to top, and finally fold in the apples, also from bottom to top.

Take a 9-10 inch cake pan, butter it, and dust with breadcrumbs mixed with a pinch of sugar. Add the batter and gently smooth the surface with a spoon.

Take the reserved half apple and slice it into half-moons. Arrange the slices on the surface in a circular pattern. A sprinkle of brown sugar won't hurt. Now, bake in a static oven at 350°F (180°C) for 40-45 minutes, being careful not to burn the surface. If necessary, cover with a sheet of aluminum foil.

Once the cake is baked (toothpick test), let it cool outside the oven. Prepare the gelatin and generously brush it over the cake. Place in the fridge to cool, and then enjoy... a tip: try it with a drizzle of chocolate topping... FANTASTIC!!!!