Zebra Cupcake - 斑马杯蛋糕

After seeing so many Zebras being "borned" (a lot of my blog mates were baking this), i thought of baking it too, as it looks so nice. But after making the batter than i realised that the batter is too little for my 9'' pan. So instead of making Zebra cake, they became Zebra Cupcakes.
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The recipe called for emulsifier but i don't have that so i left it out. In the end, my cake turns out to be quite rubbery and dense..
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Zebra Cake Recipe

INGREDIENTS:
Makes one 8" round cake

6 small eggs
110g castor sugar
150g cake flour
½ tsp baking powder
½ tbsp emulsifier
100g butter, melted
30g condensed milk
2 tsp cocoa powder
3-4 tbsp water
1 tsp chocolate emulco
Dissolve cocoa powder and chocolate emulco in water.

METHOD:
(1) Preheat oven at 170 degC. Sift flour and baking powder. Set aside.
(2) Beat eggs, flour, castor sugar and emulsifier on high speed for 10 minutes or until batter turns light and creamy, i.e. thick ribbon state. To test, lift beater. Batter drops from beater should disappear when you count from 1 to 10.
(3) Pour melted butter, condensed milk. Mix at slow speed.
(4) Divide batter into 2 equal portions. Fold chocolate solution into one of the batters.
(5) Using tablespoon, scoop 3 tbsp of uncoloured batter into centre of cake pan. Then, scoop 3 tbsp of chocolate batter onto the uncoloured batter you just scooped into the pan.
Repeat until you have finished about half of the batter. Reduce to 2 scoops each now and continue layering. Reduce the amount of batter gradually until you only pour 1 scoop of each batter finally. The circles become smaller and smaller.
(6) Bake at 170 degC for 35 minutes.

Source: from Jo's Deli & Bakery