Soda quenched in yoghurt, until bubbling, add sugar and the oil and stirred to dissolve the sugar. Add the flour, cocoa and cinnamon and walnuts broken in large pieces. Place in a greased and lightly floured pan (to St. Valentin is recommended to be cookie cutter heart) and bake about 20 minutes. , In a pre-heated to 180C, an oven. Pour melted with a little water or milk (about 1-2 tbsp) and leave to set. Decorate optional. Serve with fresh fruit in season or with ice cream. * This is a beautiful and quick cake, which will make your lover to love more in you. Quick and easy dessert, suitable for beginners and chefs. Can be made into mini shapes such as cakes, muffins for children. An easy and always with a good result cake loved even those who do not like a lot of chocolate. * Conceived by me as a student (such as blurring of an unsuccessful cake), this is one of the most frequently sought and favorite desserts today.