Pastry: Mix flour, almond powder and icing sugar. Add the butter and "sand" the mixture. Stir in the egg and water and work quickly to form a ball. Spread the dough between two sheets of foil and place in a pie dish. Prick with a fork, cover and chill.
The filling: Mix the almond powder with 40g of sugar. Beat the egg whites until stiff with 40g of sugar. Gently add the sugary whites to the mixture. Cut the candied melon into thin slices and garnish the bottom of the pie. Cover completely with the mixture. Bake for 30min.
Honey syrup: Bring the water and honey to a boil, stirring until the mixture becomes syrupy. Pour over the pie and let cool.