Preheat oven to 165 Celsius. Grease a 1 pound loaf pan (8.5 x 4.5 x 2.75 inch) and set aside.
Combine flaxseed meal and water. Let rest for few minutes until thicken.
In a large mixing bowl, sift dry ingredients and mix well.
Whisk together wet ingredients and flaxseed mixture. Pour mixture to dry mixture. Gently fold the mixture with a spatula to incorporate.
Pour mixture into a prepared pan. Tap gently against the counter to release any air bubbles.
Bake at preheated oven for 1 hour or until the toothpick comes out clean. Allow cake to cool completely in the pan. Gently remove cake out of the pan. Place the cake in the fridge for at lease 2 hours before serving. Spread melted chocolate over the cake. Slice and serve.