Pre-heat the oven to 180 degrees centigrade.
In a large mixing bowl sieve both the flours, baking flour, soda-bi-carb, salt ( if using), ground cinnamon and all-spice powder. Give it a good mix after you have sieved these dry ingredients.
Place a 10 inch skillet on a very slow flame. Add 2 tablespoons butter to it and allow it to melt.
In another mixing bowl, using a wooden spoon or electric mixer beat 100 grams butter and sugar one a little pale add eggs one at a time. Add in the thick yogurt and vanilla extract.
Fold in the dry ingredients into the butter-sugar-yogurt mix.
Transfer the batter to the heated skillet. Working quickly arrange the fruits of your choice on the top and sprinkle the granulated sugar.
Bake at 170 degrees centigrade for 30-35 minutes or until a toothpick inserted in the center comes out clean.
Allow the cake to cool down before slicing it.
Serve it along with tea or coffee or simply enjoy with some whipped cream and fruits.