Mix baking soda in yoghurt. In a bowl, mix the milk with the sugar, the oil and mix well. Add sifted flour with vanilla and then orange peel. Add sweet - I put a sweet mix of whole fruit (homemade). Optional you can add a little cocoa (powder) to the mix. I add, alternating row of the mixture, a little sprinkled with cocoa mixture and then turn zavvarshih cocoa aroma. Pour into cake pan. Bake at 160C degrees, while baking, it depends on the oven - so do not give time. Check with a toothpick - when dry out is ready. For the icing 2/3 cup icing sugar is mixed with small orange juice - to obtain a thick mixture was watered cake. The remaining 1/3 cup powdered sugar mix with cocoa and again add orange juice to a thick mixture - and again watered cake.