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Preheat the oven to 350 degrees F.
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Grease and flour a large bundt pan.
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Whisk together the all-purpose flour, baking powder, and salt. Set aside.
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Beat the eggs and white granulated sugar together until creamy.
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Add the vanilla extract, egg liquor, and sunflower oil. and beat until creamy.
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Turn the mixer speed down to low and add the flour a bit at a time until just combined.
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Pour half the batter into the prepared bundt pan. Add the cocoa powder to the remaining batter and beat to incorporate.
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Add the dark batter on top of the light batter. Use a fork to swirl the batter in a spiral motion to create the marbling effect.
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Place the pan in the oven and bake for 1 hour or until a knife inserted into the middle of the cake comes out clean.
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Remove from the oven and let cool completely in the pan before removing.
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Transfer to a wire rack fitted over a parchment paper-lined baking sheet. Let cool completely.