INGREDIENTS
200g (1 ½ cups) cake flour
10g (2 tsp) baking powder
5g (1 tsp) baking soda
5g (1 tsp) salt
50g (½ cup) cocoa powder
150ml (½ cup + 2 tbsp) vegetable oil
6 egg yolks
150ml (½ cup + 2 tbsp) milk
125g (½ cup) sugar
6 egg whites
5ml (1 tsp) white vinegar
150g (¾ cup) sugar

METHOD
1. Preheat the oven to 170°C/340°F.
2. In a medium bowl whisk flour with baking powder, baking soda, and salt.
3. In another bowl whisk cocoa powder with vegetable oil.
4. In a medium bowl beat egg yolks with sugar until pale and creamy, add milk.
5. Finally, beat egg whites with vinegar and sugar until stiff peaks form.
6. Combine egg yolk mixture with cocoa mixture. Add dry ingredients, whisk, then fold in egg whites carefully.
7. Pour the batter into a 22cm baking pan and bake for 60 minutes or until cooked through.