Make the flax egg by mixing together the ground flaxseeds and water. Set aside.
In a food processor or bowl, combine the almond flour, tapioca flour, coconut sugar and sea salt. Process until combined. Add the coconut oil and flax egg and mix again, adding in the water bit by bit until the dough comes together. You may not need all of it. If you’re mixing in a bowl, use your hands to bring the dough together at the end. Refrigerate the dough for 30 minutes.
Preheat oven to 350F. Place a piece of parchment paper on a baking sheet and dust lightly with almond flour. Roll the dough into a 3-5 mm thick circle and place the filling in the middle, leaving 2-inches around the edge empty. Gently fold the sides up, creasing the dough as you go. You can use the parchment paper if needed so it doesn’t break. Brush the dough with almond milk and bake for 35-45 minutes, until browned. Let cool for 10 minutes before cutting. Drizzle with maple syrup if needed.