To eggs add the sugar. Beat with mixer until graying. Initially, the mixer is switched to a lower level and gradually increases the agitator speed. Beat eggs, add 3 vanilla 1 tsp baking powder. Stir gently in one direction with a wooden spoon or spatula. The oven is turned on for heating at 200 C. Sift the flour through a sieve over a deep dish. Flour spoon by spoon added alternately spoon flour trickle sunflower oil. Stirring was continued until the moment at which did not get confused smooth dough. Finally, add the ground walnuts and mix again. Take a rectangular baking dish. Spread the bottom and the surrounding edge with butter. Stir the batter evenly distributed in the pan. The oven switches to the lower baking. Cake put baking. After 10-15 minutes as crane whenever dough lightly pan out. Arrange evenly on top blackberries. Crisp returned to the oven. Leave for 15 minutes on a lower baking, and then flips to the top baking. Allow to be baked for 15 min, then removed from the oven. Sprinkle the top generously with powdered sugar. Cuts are cold of diamonds or squares.