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Preheat the oven to 180°C (350°F). Grease and flour a loaf pan or cake tin.
In a large mixing bowl, cream the margarine and castor sugar until light and fluffy.
Beat in the eggs one at a time, ensuring each is fully incorporated.
Add the oil, milk, and vanilla extract; mix well.
In a separate bowl, sift together the flour, baking powder, salt, and cocoa powder.
Gradually add the dry ingredients to the wet mixture, stirring gently to form a smooth batter.
Remove about one-third of the batter and mix in the cocoa powder until evenly blended for the chocolate portion.
Spoon alternating dollops of vanilla and chocolate batter into the prepared pan. Use a skewer or knife to swirl the two batters, creating a marbled effect.
Bake for 50–60 minutes or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 15 minutes before transferring to a wire rack to cool completely.
Serving and Storage Tips
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