Whisk the egg yolks with the sugar until it dissolves, then gradually add the oil, then the water and then the flour until it forms a dough.
With a spatula mix the egg white foam into the dough.
Pour the dough into a baking dish lined with butter and flour, then sprinkle the currants and fir buds over the dough.
The berries can be fresh or frozen, or you can use any other kind of berries, for example blueberries.
Bake the cake in a preheated oven at 180°C (356°F) for about 15-20 minutes. The baking time may vary depending on the size of the tray used, a thicker dough will need a longer baking time.
It's great with whipped cream or vanilla cream on the side. :)