In a bowl, whisk the eggs with sugar until foaming. Then added lemonade (it and other non-alcoholic) and again stir nice. Add sifted flour with baking powder with a spoon as not cease to fight. Finally add the chocolate and the oil. Stir until homogeneous. The resulting dough is poured into a greased and floured pan with a diameter of about 30 cm. Bake 25-30 minutes at 180C.