For the apple-coconut slice, beat egg whites until stiff. Beat yolks with honey and water until foamy. Stir in all other ingredients, fold in beaten egg whites.
Place on a small baking tray and bake at 180 °C for about 20 minutes.
For the topping, finely chop the apples and banana in a food processor. Mix in the honey and lemon juice and zest and pour onto the cooled base.
Serve the apple and coconut slices immediately.