Giraffe Patterned Swiss Roll Cake ✿✿Ingredients ✿✿For the egg-yolk batter (the yellow parts) ✿3 egg yolks ✿15g castor sugar ✿40g vegetable oil ✿60g milk ✿1 tsp vanilla essence ✿50g cake flour, sifted ✿20g corn flour, sifted ✿✿For the cake batter (the brown parts) ✿3 egg whites ✿50g castor sugar ✿10g cocoa powder (adjust according to taste/colour preference)