In a bowl wish together eggs and sugar to a pale yellow cream.
Add the melted butter, mix.
Add the flour one tablespoon at the time.
Add the almond meal and the water. Mix to obtain a silky texture.
Add the lemon zest. Mix.
Transfer the batter in the baking pan and spread evenly. Set aside.
Peel, core and slice the apples, 1/4 inch thick.
Insert the apple slices vertically in the batter creating a pattern. Create groups of 6 slices, flipping the direction each time to create a checker board look.
Sprinkle some sugar on top of the apples and bake in preheated oven to 400F for 35 min. Let it cool down 5 min and enjou!