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1
Preheat oven at 180 C. Grease a 9-inch round baking tin and set it aside.
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2
In a medium bowl, sift together flour, baking powder, salt and baking soda and keep aside.
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3
In another bowl, use a mixer to blend together the oil and sugar, till it forms a creamy mixture. Add eggs, vanilla extract, water and vinegar. Whisk on medium speed till everything is mixed together completely.
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4
Now, lightly fold in the dry ingredients making sure no lumps are formed.
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5
In a third medium-sized bowl, put half of the cake batter. Into that bowl add cocoa powder and coffee powder and whisk to form a smooth chocolaty batter. So now you have two equal-sized bowls of batter, one plain and one with chocolate flavor.
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6
Take the baking tin, pour in 2 tablespoons of plain batter, then 2 tablespoons of chocolate batter over it, and continue these layers one by one till both batters are finished. Now take a toothpick and drag it through the batter from the center out to make web design or make any design that you desire.
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7
Bake at 180 C for 40 minutes. Then do the toothpick test: Insert a toothpick at the center of the cake and if it comes out clean, cake is done. Cool the cake and then serve as desired.
