Puree the beetroot in a tall, narrow container (otherwise there is a risk of splashing and the beetroot will never come out!). I always use the shrink-wrapped, pre-cooked beetroot tubers. Put the puree in a bowl, add all the other ingredients and stir well.
Grease a loaf pan or line it with baking paper and add the dough. Bake the cake at 180 degrees for 50 - 60 minutes. Use the chopsticks to check that the cake is ready.
When the cake has cooled down, you can dust it with powdered sugar or coat it with couverture.