# Cook the ingredients of the upper side: granulated sugar
and butter in a skillet, until the sugar
dissolves totally. Add thickly pounded walnut
into the mixture and roast the mixture for a while more. Remove the mixture from the stove and add circle shaped banana
slices into the mixture, mix it.
# Place a grease-proof paper into a baking bowl, which has 10 inches diameter, by hanging the edges of the paper out of the bowl. Place the prepared banana
mixture on it.
# Whisk the mixture of granulated sugar
and eggs in a deep bowl, until the sugar
dissolves totally. Add sunflower oil, sifted flour
, baking powder and vanilla onto this mixture.
# Whisk the mixture, until the flour
spreads in the mixture homogenously. Pour the cakes mixture over the banana
mixture and flatten it gently.
# Place the mould into the oven, which is preheated to 347 F. Bake the cake for about 40-45 minutes, without opening the door of the oven.
# After removing the cake from the oven, when the cake reaches to the room temperature remove the grease-proof paper and serve it.