Whisk together the egg and water to make an egg wash. Set aside.

Preheat your oven to 425 degrees.

Line a baking sheet with parchment paper.

Roll out the puff pastry onto a lightly floured surface.

Slice the pastry into 6 even squares (see picture below).

Slice your bananas and spread them out evenly between the 6 squares.

Add a heaping tbsp of Nutella to each square, on top of the bananas.

Add a heaping tbsp of coconut to each square, on top of the Nutella.

Fold over the pastry to form a pocket, sealing the edges. If needed, seal the edges with a brush of egg wash.

Once the pocket is formed, brush the tops lightly with the egg wash, then sprinkle generously with sugar.

Bake for about 15 minutes. The pastry should be puffed up and lightly browned.

Cool slightly before serving.