To make the galette dough: Place the flour, coconut sugar and salt in the bowl of a food processor. Pulse to mix. Then add the butter and pulse again until mixture resembles small crumps. Turn the mixer on again and add in the water. At this point, a ball should be forming. Transfer the dough onto a lightly floured surface and form a ball, wrap with cling film and refrigerate for at least 1 hour.
To make the filling: Place the peaches, nectarines and apricots in a bowl. Add the maple syrup, vanilla and coconut sugar and mix.
Preheat the oven to 180° C. Place a sheet of parchment paper on your oven’s baking tray.
On a lightly floured surface, roll out the dough into a large 25cm circle. Transfer onto the baking tray. Sprinkle the dough evenly with the almond flour, leaving a 4cm border on the sides. Then spread the fruit on top, again leaving a 4cm border around the edges. Roll in the sides of the dough, overlapping as you go around pleating the dough. Brush the crust with the egg yolk and sprinkle with the crushed the almonds, lightly pressing to make sure they stick.
Bake for 50-55 minutes until the crust turns golden brown. Transfer the galette onto a wire rack to cool slightly and serve while still warm, with vanilla ice cream!