Beat all ingredients (A1) on low speed for 2mins or until evenly combined.
Scrape down the batter and beat on medium speed. Gradually add in ingredient (A2) until fluffy and light in color for 3 - 5min. Then divide the batter into 3 portions.
Mix batter and all ingredients (B) until evenly combined.
Mix batter and all ingredients (C) until evenly combined.
Place ¼ cup of chocolate batter in the center of the cake pan and ¼ cup orange batter directly on top of the chocolate batter. Repeat the process again.
With every 3rd process, add in ¼ cup plain batter and repeat the process again.
Then bake at pre-heated oven at 180°C (top) and 170°C (bottom) for about 50mins and set aside to let it cool
Coat the whipped cream and decorate to your desire preference.