First thing, mix the ground flax seeds with 10 tablespoon of water and refrigerate for 5 minutes
Pre-heat the oven at 180° C / 350 F
In a bowl mix well flours, cocoa powder, sugar, cream of tartar and baking soda
In another bowl mix the milk, the oil and the liqueur and add it to the dry ingredients, mixing everything thouroughly until you have a uniform and smooth batter
Add the flaxseed "gel", carefully incorporating it to the batter
Grease or (better) cover with parchment paper a loaf pan and pour ⅓ of the batter, spreading it all over the bottom of the pan
Peel the pears, leaving them whole and without removing the stalk and place them vertically in the loaf pan
With a spoon (or a sac-a-poche), pour the remaining cake batter until you cover the pears. The top of the pears and their stalks should remain outside of the cake
Bake for 30 - 35 minutes: you can start checking the cake with a toothpick after 25 minutes (be careful to insert the toothpick only where the batter is and not into the pears). When the toothpick comes out clean the cake is ready
Once baked, remove from oven and let the cake cool down before removing it from the pan
Place the cake on a serving plate and add all the chocolate spread you want on top (this step is optional. Naaah, it is not)