Carrot cake

Another family recipe with a tasty result.
Ingredients:
225 gr plain flour
2 teaspoons baking powder
2 large eggs
125 gr brown sugar
125 ml sunflower oil
1 teaspoon ginger powder
1 teaspoon cinnamon powder
1 apple
200 gr orange juice and zest
50 gr walnuts
Icing
75 gr butter soften
100 icing sugar
75 gr cream cheese
Topping
Walnuts and orange zest