Zebra Cake with Chocolate and Vanilla Layers

Beat egg whites until stiff, then add half the sugar and beat until firm; reserve

Beat egg yolks with remaining sugar until light and creamy, then add water and beat until frothy

Add baking powder, flour, and oil to the yolk mixture and beat until homogeneous

Gently fold the reserved egg whites into the batter until incorporated

Divide the batter into two bowls and mix cocoa powder into one bowl

Place a full spoonful of plain batter in the center of the greased and floured pan and top with a full spoonful of chocolate batter

Repeat alternating batters, placing each spoonful in the center, until all batter is used

Bake in a preheated oven at 180°C for about 50 minutes; let cool before unmolding and serving