Add the butter chunks, and using a fork (or a pastry cutter) break the butter up until mixture resembles coarse, pea-sized crumbs.
Pour in the cold water until the dough comes together. Add an additional tbsp of water if needed.
On a lighly flourer surface, roll the dough into a ball and flatten it into a disk.
Wrap the dough with some cling flim. Place in the refrigerator for at least 1 hour, or up to 3 days.
Pre-heat oven to 190°C/170°C fan.
Sprinkle your worksurface with some flour and roll your dough into a 12 inch circle (it doesn't have to be perfect!)
Transfer the dough onto a pre-linned baking sheet by placing your rolling pin in the middle of the dough and folding over the edges.
Using a ruler, messure 2-inches from four of the edges.
Spread the softened vegan butter in the center of the galatee, avoiding going past the marked edges. (save around 1 tbsp of vegan butter to glaze the crust)
Spinkle coconut sugar and ground cinnamon over the butter (save around 1 tbsp of coconut sugar to sprinkle on the crust)
Peel your apples and cut them in half, then half again. Slice the quarters into very thin slices.
Fan out the apples by pressing each section carefully (or by giving them a gentle nudge).
Place the fanned out apple slices over the coconut sugar and cinnamon mixture.
Carefully fold over the pastry over the apples. Press to seal the edges.
Spread vegan butter on the crust, then sprinkle the remaining coconut sugar and a little nutmeg (optional).