Preheat your oven to 180 degrees Celsius (approximately 350-375 degrees Fahrenheit). 2. Lightly grease and flour a baking pan, or line it with parchment paper. 3. In a large mixing bowl, combine the self-raising flour, coco sugar, raw cacao, and baking powder. Whisk them together until they are well mixed. 4. In a separate medium bowl, combine the flax eggs, almond milk, vanilla, and boiling water. Stir these wet ingredients together. 5. Pour the wet ingredient mixture into the dry ingredient mixture. Stir gently until just combined and the batter is smooth. Do not overmix. 6. Pour the cake batter evenly into the prepared baking pan. 7. Place the pan in the preheated oven and bake for 45 minutes. 8. To check if the cake is done, insert a toothpick into the center of the cake. If the toothpick comes out clean, the cake is ready. 9. Let the cake cool in the pan for 10-15 minutes. Then, carefully transfer it to a wire rack to cool completely. 10. Once the cake has cooled, you may decorate it with melted vegan chocolate if desired.