To make the crust, mix the flour, sugar, and salt. Add in the cubed butter and use two forks or a pastry cutter to cut the butter into the flour until it resembles sand/has a crumbly consistency. Slowly add in the ice water one tablespoon at a time and mix with a spatula or wooden spoon until dough comes together. You may not need to use all the water. I used my hands to lightly knead/squeeze the dough together after I stirred it. Flatten dough into a thick round disk and wrap with plastic wrap. Put in the freezer for 20-30 minutes or the refrigerator for 1 hour.
While dough is chilling, preheat the oven to 400 degrees F. In a large bowl, mix sliced persimmons and coconut sugar until evenly combined. Once dough is chilled, place dough on a large piece of parchment paper. Lightly flour both sides and roll it out into a 12 inch circle and about 1/4 inch thick. It doesn’t have to be perfect, we are going for rustic here.
Spread nutella evenly over the dough, leaving a 1 1/2 inch margin around the circle. Then layer the persimmon slices on top of the nutella. Fold the edges of the galette over the filling and pleat all the way around. Brush the almond milk over the crust/pleated edges and sprinkle coconut sugar over the edges.
Place the galette with parchment paper onto a large baking sheet and bake for 40-50 minutes or until edges are a nice golden brown. Let it cool for at least 30 minutes to 1 hour before slicing. Best eaten warm! Enjoy! If you eat it as leftovers, warm it up for a few seconds and it will taste just as good!