Beat the yogurt with the baking soda, add 1 cup of sugar and oil. Mix the dry flour with the cocoa and cinnamon, and gradually add them to the yogurt.
Finally, add the raisins and pour it into a greased and sprinkled with flour baking shape.
Bake in a preheated oven at 356°F (180 °C). Let the baked cake cool and cover with a cooled sugar syrup made from 1 cup sugar and boiling water.