Plum cake with chestnut flour

90 grams of flour
90 grams of chestnut flour
90 grams of sugar
3 eggs
250 grams of plain yogurt
100 grams of extra virgin olive oil
the zest of one orange
10 walnuts 1 package of baking powder
This simple cake has a very low sugar content. Work the eggs with the yogurt, the olive oil and the  orange zest, In a bowl mix flour, sugar and baking powder, then add to the mixture with eggs. Mix well and at the end add the chopped walnuts. Put to cook in preheated oven at 180°C in a well greased baking tray. Cook for 40 minutes.
Patrizia's Italian Cookbook: http://amzn.to/1WAKMRk