Set the oven to 190°C. Grease and line a loaf tin with paper basket or parchment paper.
Using a blender, process the beets until you get a coarse texture. Sprinkle with a pinch of salt, then add the other ingredients except the chocolate and oil.
Combine gently until you get a smooth batter, then add the oil slowly, while stirring constantly.
Crush the chocolate into tiny pieces and fold into the batter.
Transfer the batter into the tin, spreading it out evenly.
Bake for 50-60 minutes in the middle of the oven or until an inserted skewer comes out clean.
Allow to cool in the tin for 10 minutes, then move it to a wire-rack to cool completely.